MySQL Tutorial/Procedure Function/Create Table

Create a table in a procedure

mysql> delimiter $$
mysql>
mysql>
mysql> CREATE PROCEDURE myProc()
    -> BEGIN
    ->      DECLARE i INT DEFAULT 1;
    ->
    ->      SET autocommit=0;
    ->
    ->      DROP TABLE IF EXISTS test_table ;
    ->      CREATE TABLE test_table (
    ->           id        INT PRIMARY KEY,
    ->            some_data VARCHAR(30))
    ->      ENGINE=innodb;
    ->
    -> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> delimiter ;
mysql> call myProc();
Query OK, 0 rows affected, 1 warning (0.08 sec)
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql> desc test_table;
+-----------+-------------+------+-----+---------+-------+
| Field     | Type        | Null | Key | Default | Extra |
+-----------+-------------+------+-----+---------+-------+
| id        | int(11)     | NO   | PRI |         |       |
| some_data | varchar(30) | YES  |     | NULL    |       |
+-----------+-------------+------+-----+---------+-------+
2 rows in set (0.00 sec)
mysql> drop table test_table;
Query OK, 0 rows affected (0.03 sec)
mysql>

Create a TEMPORARY table and save data into it in a procedure

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>
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> DELIMITER $$
mysql>
mysql> CREATE PROCEDURE myProc(in_id INT)
    ->     MODIFIES SQL DATA
    -> BEGIN
    ->     DECLARE l_employee_id INT;
    ->     DECLARE l_salary      NUMERIC(8,2);
    ->     DECLARE l_new_salary  NUMERIC(8,2);
    ->     DECLARE done          INT DEFAULT 0;
    ->
    ->     DECLARE cur1 CURSOR FOR
    ->             SELECT id, salary
    ->               FROM employee
    ->              WHERE id=in_id;
    ->
    ->     DECLARE CONTINUE HANDLER FOR NOT FOUND SET done=1;
    ->
    ->     CREATE TEMPORARY TABLE IF NOT EXISTS emp_raises
    ->       (employee_id INT, new_salary NUMERIC(8,2));
    ->
    ->     OPEN cur1;
    ->     emp_loop: LOOP
    ->
    ->       FETCH cur1 INTO l_employee_id, l_salary;
    ->
    ->       IF done=1 THEN       /* No more rows*/
    ->          LEAVE emp_loop;
    ->       END IF;
    ->
    ->       set l_new_salary = 1233.12;
    ->
    ->       UPDATE employee
    ->             SET salary=l_new_salary
    ->           WHERE id=l_employee_id;
    ->          /* Keep track of changed salaries*/
    ->          INSERT INTO emp_raises (employee_id,new_salary)
    ->           VALUES (l_employee_id,l_new_salary);
    ->
    ->
    ->     END LOOP emp_loop;
    ->     CLOSE cur1;
    ->     /* Print out the changed salaries*/
    ->
    ->     SELECT id,salary from employee;
    ->
    ->     SELECT employee_id,new_salary from emp_raises
    ->      ORDER BY employee_id;
    -> END $$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> DELIMITER ;
mysql> call myProc(1);
+------+---------+
| id   | salary  |
+------+---------+
|    1 | 1233.12 |
|    2 | 6661.78 |
|    3 | 6544.78 |
|    4 | 2344.78 |
|    5 | 2334.78 |
|    6 | 4322.78 |
|    7 | 7897.78 |
|    8 | 1232.78 |
+------+---------+
8 rows in set (0.01 sec)
+-------------+------------+
| employee_id | new_salary |
+-------------+------------+
|           1 |    1233.12 |
+-------------+------------+
1 row in set (0.01 sec)
Query OK, 0 rows affected, 1 warning (0.01 sec)
mysql> drop procedure myProc;
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql>
mysql>
mysql>
mysql>
mysql> drop table Employee;
Query OK, 0 rows affected (0.00 sec)

CREATE TEMPORARY TABLE in a procedure

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 (0.01 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> 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> delimiter $$
mysql>
mysql> CREATE PROCEDURE myProc()
    ->
    -> BEGIN
    ->   DROP TEMPORARY TABLE IF EXISTS employeeTemp;
    ->   CREATE TEMPORARY TABLE employeeTemp AS
    ->   SELECT id,start_date
    ->     FROM employee;
    -> END$$
Query OK, 0 rows affected (0.00 sec)
mysql>
mysql> delimiter ;
mysql> call myProc();
Query OK, 0 rows affected, 1 warning (0.00 sec)
mysql> select * from employeeTemp;
+------+------------+
| id   | start_date |
+------+------------+
|    1 | 1996-07-25 |
|    2 | 1976-03-21 |
|    3 | 1978-12-12 |
|    4 | 1982-10-24 |
|    5 | 1984-01-15 |
|    6 | 1987-07-30 |
|    7 | 1990-12-31 |
|    8 | 1996-09-17 |
+------+------------+
8 rows in set (0.00 sec)
mysql> drop TEMPORARY TABLE employeeTemp;
Query OK, 0 rows affected (0.00 sec)
mysql> drop procedure myProc;
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>