SQL/MySQL/View/Create View

Материал из SQL эксперт
Перейти к: навигация, поиск

Adding ORDER BY to the Joined Table View

   <source lang="sql">

mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.03 sec) mysql> mysql> create table job ( 

   ->   id         int,
   ->   title      VARCHAR(20)
   -> );

Query OK, 0 rows affected (0.05 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.02 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into job (id, title) values (1,"Tester"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (2,"Accountant"); Query OK, 1 row affected (0.01 sec) mysql> insert into job (id, title) values (3,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (4,"Coder"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (5,"Director"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (6,"Mediator"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (7,"Proffessor"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (8,"Programmer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (9,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from job; +------+------------+ | id | title | +------+------------+ | 1 | Tester | | 2 | Accountant | | 3 | Developer | | 4 | Coder | | 5 | Director | | 6 | Mediator | | 7 | Proffessor | | 8 | Programmer | | 9 | Developer | +------+------------+ 9 rows in set (0.00 sec) mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> mysql> CREATE ALGORITHM = TEMPTABLE VIEW myView 

   -> (id, first_name, title) AS
   -> SELECT o.id, o.first_name, c.title
   -> FROM job c, employee o
   -> WHERE o.id = c.id;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> select * from myView order by first_name; +------+------------+------------+ | id | first_name | title | +------+------------+------------+ | 2 | Alison | Accountant | | 4 | Celia | Coder | | 7 | David | Proffessor | | 8 | James | Programmer | | 3 | James | Developer | | 1 | Jason | Tester | | 6 | Linda | Mediator | | 5 | Robert | Director | +------+------------+------------+ 8 rows in set (0.00 sec) mysql> mysql> drop view myView; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> drop table job; Query OK, 0 rows affected (0.01 sec) mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> mysql> 

       </source>


Creating a view by joining two tables

   <source lang="sql">
 mysql>

mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.09 sec) mysql> mysql> create table job ( 

   ->   id         int,
   ->   title      VARCHAR(20)
   -> );

Query OK, 0 rows affected (0.08 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into job (id, title) values (1,"Tester"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (2,"Accountant"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (3,"Developer"); Query OK, 1 row affected (0.01 sec) mysql> insert into job (id, title) values (4,"Coder"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (5,"Director"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (6,"Mediator"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (7,"Proffessor"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (8,"Programmer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (9,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from job; +------+------------+ | id | title | +------+------------+ | 1 | Tester | | 2 | Accountant | | 3 | Developer | | 4 | Coder | | 5 | Director | | 6 | Mediator | | 7 | Proffessor | | 8 | Programmer | | 9 | Developer | +------+------------+ 9 rows in set (0.00 sec) mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.01 sec) mysql> mysql> mysql> mysql> CREATE VIEW myView AS 

   -> SELECT employee.first_name,job.title
   -> FROM employee join job using (id) ;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> select * from myView; +------------+------------+ | first_name | title | +------------+------------+ | Jason | Tester | | Alison | Accountant | | James | Developer | | Celia | Coder | | Robert | Director | | Linda | Mediator | | David | Proffessor | | James | Programmer | +------------+------------+ 8 rows in set (0.00 sec) mysql> mysql> drop view myView; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> drop table job; Query OK, 0 rows affected (0.00 sec) mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> mysql> 

 </source>


Creating a View with Joined Tables

   <source lang="sql">

mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.02 sec) mysql> mysql> create table job ( 

   ->   id         int,
   ->   title      VARCHAR(20)
   -> );

Query OK, 0 rows affected (0.06 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.01 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into job (id, title) values (1,"Tester"); Query OK, 1 row affected (0.01 sec) mysql> insert into job (id, title) values (2,"Accountant"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (3,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (4,"Coder"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (5,"Director"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (6,"Mediator"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (7,"Proffessor"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (8,"Programmer"); Query OK, 1 row affected (0.02 sec) mysql> insert into job (id, title) values (9,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from job; +------+------------+ | id | title | +------+------------+ | 1 | Tester | | 2 | Accountant | | 3 | Developer | | 4 | Coder | | 5 | Director | | 6 | Mediator | | 7 | Proffessor | | 8 | Programmer | | 9 | Developer | +------+------------+ 9 rows in set (0.00 sec) mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> CREATE ALGORITHM = TEMPTABLE VIEW myView 

   -> (id, first_name, title) AS
   -> SELECT o.id, o.first_name, c.title
   -> FROM job c, employee o
   -> WHERE o.id = c.id;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> select * from myView; +------+------------+------------+ | id | first_name | title | +------+------------+------------+ | 1 | Jason | Tester | | 2 | Alison | Accountant | | 3 | James | Developer | | 4 | Celia | Coder | | 5 | Robert | Director | | 6 | Linda | Mediator | | 7 | David | Proffessor | | 8 | James | Programmer | +------+------------+------------+ 8 rows in set (0.00 sec) mysql> mysql> drop view myView; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> mysql> drop table job; Query OK, 0 rows affected (0.02 sec) mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> 

       </source>


Creating a View with Specified Column Names

   <source lang="sql">

mysql> mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.03 sec) mysql> mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> mysql> mysql> CREATE VIEW myView (vid, vfirstname) AS 

   ->    SELECT id, first_name FROM employee WHERE id = 1;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> SELECT * FROM myView; +------+------------+ | vid | vfirstname | +------+------------+ | 1 | Jason | +------+------------+ 1 row in set (0.01 sec) mysql> mysql> mysql> drop view myView; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) 

       </source>


Creating a View with UNION

   <source lang="sql">

mysql> mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.02 sec) mysql> mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.01 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> mysql> CREATE VIEW myView AS 

   -> SELECT * FROM employee where id = 1
   -> UNION SELECT * FROM employee where id = 2
   -> UNION SELECT * FROM employee where id = 3;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> select * from myView; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 3 rows in set (0.00 sec) mysql> mysql> drop view myView; Query OK, 0 rows affected (0.01 sec) mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> 

       </source>


Creating Views

   <source lang="sql">

mysql> mysql> mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.02 sec) mysql> mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> mysql> mysql> CREATE VIEW myView AS 

   ->    SELECT id, first_name FROM employee WHERE id = 1;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> SELECT * FROM myView; +------+------------+ | id | first_name | +------+------------+ | 1 | Jason | +------+------------+ 1 row in set (0.02 sec) mysql> mysql> mysql> drop view myView; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> mysql> 

       </source>


Using a GROUP BY Clause to Create a View

   <source lang="sql">

mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.02 sec) mysql> mysql> create table job ( 

   ->   id         int,
   ->   title      VARCHAR(20)
   -> );

Query OK, 0 rows affected (0.05 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into job (id, title) values (1,"Tester"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (2,"Accountant"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (3,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (4,"Coder"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (5,"Director"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (6,"Mediator"); Query OK, 1 row affected (0.02 sec) mysql> insert into job (id, title) values (7,"Proffessor"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (8,"Programmer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (9,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from job; +------+------------+ | id | title | +------+------------+ | 1 | Tester | | 2 | Accountant | | 3 | Developer | | 4 | Coder | | 5 | Director | | 6 | Mediator | | 7 | Proffessor | | 8 | Programmer | | 9 | Developer | +------+------------+ 9 rows in set (0.00 sec) mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> mysql> CREATE ALGORITHM = TEMPTABLE VIEW myView 

   -> (id, first_name, title) AS
   -> SELECT o.id, o.first_name, c.title
   -> FROM job c, employee o
   -> WHERE o.id = c.id;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> select * from myView group by title; +------+------------+------------+ | id | first_name | title | +------+------------+------------+ | 2 | Alison | Accountant | | 4 | Celia | Coder | | 3 | James | Developer | | 5 | Robert | Director | | 6 | Linda | Mediator | | 7 | David | Proffessor | | 8 | James | Programmer | | 1 | Jason | Tester | +------+------------+------------+ 8 rows in set (0.02 sec) mysql> mysql> drop view myView; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> drop table job; Query OK, 0 rows affected (0.00 sec) mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> 

       </source>


Using a GROUP BY Clause to Create a View ALGORITHM = TEMPTABLE

   <source lang="sql">

mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.03 sec) mysql> mysql> create table job ( 

   ->   id         int,
   ->   title      VARCHAR(20)
   -> );

Query OK, 0 rows affected (0.05 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into job (id, title) values (1,"Tester"); Query OK, 1 row affected (0.01 sec) mysql> insert into job (id, title) values (2,"Accountant"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (3,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (4,"Coder"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (5,"Director"); Query OK, 1 row affected (0.02 sec) mysql> insert into job (id, title) values (6,"Mediator"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (7,"Proffessor"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (8,"Programmer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (9,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from job; +------+------------+ | id | title | +------+------------+ | 1 | Tester | | 2 | Accountant | | 3 | Developer | | 4 | Coder | | 5 | Director | | 6 | Mediator | | 7 | Proffessor | | 8 | Programmer | | 9 | Developer | +------+------------+ 9 rows in set (0.00 sec) mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.00 sec) mysql> mysql> mysql> mysql> CREATE ALGORITHM = TEMPTABLE VIEW myView 

   -> (city, number_of_employee) AS
   -> SELECT city, count(id)
   -> FROM employee
   -> GROUP BY city;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> select * from myView; +-----------+--------------------+ | city | number_of_employee | +-----------+--------------------+ | New York | 2 | | Toronto | 1 | | Vancouver | 5 | +-----------+--------------------+ 3 rows in set (0.02 sec) mysql> mysql> mysql> drop view myView; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> drop table job; Query OK, 0 rows affected (0.00 sec) mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> 

       </source>


Using HAVING with GROUP BY to Create a View

   <source lang="sql">

mysql> mysql> CREATE TABLE Employee( 

   ->     id            int,
   ->     first_name    VARCHAR(15),
   ->     last_name     VARCHAR(15),
   ->     start_date    DATE,
   ->     end_date      DATE,
   ->     salary        FLOAT(8,2),
   ->     city          VARCHAR(10),
   ->     description   VARCHAR(15)
   -> );

Query OK, 0 rows affected (0.01 sec) mysql> mysql> create table job ( 

   ->   id         int,
   ->   title      VARCHAR(20)
   -> );

Query OK, 0 rows affected (0.05 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->              values (1,"Jason",    "Martin",  "19960725",  "20060725", 1234.56, "Toronto",  "Programmer");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(2,"Alison",   "Mathews",  "19760321", "19860221", 6661.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(3,"James",    "Smith",    "19781212", "19900315", 6544.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(4,"Celia",    "Rice",     "19821024", "19990421", 2344.78, "Vancouver","Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(5,"Robert",   "Black",    "19840115", "19980808", 2334.78, "Vancouver","Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(6,"Linda",    "Green",    "19870730", "19960104", 4322.78,"New York",  "Tester");

Query OK, 1 row affected (0.01 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(7,"David",    "Larry",    "19901231", "19980212", 7897.78,"New York",  "Manager");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into Employee(id,first_name, last_name, start_date, end_Date, salary, City, Description) 

   ->               values(8,"James",    "Cat",     "19960917",  "20020415", 1232.78,"Vancouver", "Tester");

Query OK, 1 row affected (0.00 sec) mysql> mysql> insert into job (id, title) values (1,"Tester"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (2,"Accountant"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (3,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (4,"Coder"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (5,"Director"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (6,"Mediator"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (7,"Proffessor"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (8,"Programmer"); Query OK, 1 row affected (0.00 sec) mysql> insert into job (id, title) values (9,"Developer"); Query OK, 1 row affected (0.00 sec) mysql> mysql> select * from job; +------+------------+ | id | title | +------+------------+ | 1 | Tester | | 2 | Accountant | | 3 | Developer | | 4 | Coder | | 5 | Director | | 6 | Mediator | | 7 | Proffessor | | 8 | Programmer | | 9 | Developer | +------+------------+ 9 rows in set (0.00 sec) mysql> select * from Employee; +------+------------+-----------+------------+------------+---------+-----------+-------------+ | id | first_name | last_name | start_date | end_date | salary | city | description | +------+------------+-----------+------------+------------+---------+-----------+-------------+ | 1 | Jason | Martin | 1996-07-25 | 2006-07-25 | 1234.56 | Toronto | Programmer | | 2 | Alison | Mathews | 1976-03-21 | 1986-02-21 | 6661.78 | Vancouver | Tester | | 3 | James | Smith | 1978-12-12 | 1990-03-15 | 6544.78 | Vancouver | Tester | | 4 | Celia | Rice | 1982-10-24 | 1999-04-21 | 2344.78 | Vancouver | Manager | | 5 | Robert | Black | 1984-01-15 | 1998-08-08 | 2334.78 | Vancouver | Tester | | 6 | Linda | Green | 1987-07-30 | 1996-01-04 | 4322.78 | New York | Tester | | 7 | David | Larry | 1990-12-31 | 1998-02-12 | 7897.78 | New York | Manager | | 8 | James | Cat | 1996-09-17 | 2002-04-15 | 1232.78 | Vancouver | Tester | +------+------------+-----------+------------+------------+---------+-----------+-------------+ 8 rows in set (0.02 sec) mysql> mysql> mysql> mysql> CREATE ALGORITHM = TEMPTABLE VIEW myView 

   -> (city, number_of_employees) AS
   -> SELECT city, count(id)
   -> FROM employee
   -> GROUP BY city
   -> HAVING count(id) > 1
   -> ORDER BY city;

Query OK, 0 rows affected (0.00 sec) mysql> mysql> select * from myView; +-----------+---------------------+ | city | number_of_employees | +-----------+---------------------+ | New York | 2 | | Vancouver | 5 | +-----------+---------------------+ 2 rows in set (0.00 sec) mysql> mysql> drop view myView; Query OK, 0 rows affected (0.00 sec) mysql> mysql> mysql> mysql> drop table job; Query OK, 0 rows affected (0.00 sec) mysql> drop table Employee; Query OK, 0 rows affected (0.00 sec) mysql> 

       </source>
Источник — «http://sqle.ru/index.php?title=SQL/MySQL/View/Create_View&oldid=5329»