Oracle PL/SQL Tutorial/Query Select/Select clause

Материал из SQL эксперт
Версия от 10:09, 26 мая 2010; Admin (обсуждение | вклад) (1 версия)
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Compare with number

SQL>
SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason",  "N",  "TRAINER", 2,   date "1965-12-18",  800 , NULL,  10);
1 row created.
SQL> insert into employees values(2,"Jerry",  "J",  "SALESREP",3,   date "1966-11-19",  1600, 300,   10);
1 row created.
SQL> insert into employees values(3,"Jord",   "T" , "SALESREP",4,   date "1967-10-21",  1700, 500,   20);
1 row created.
SQL> insert into employees values(4,"Mary",   "J",  "MANAGER", 5,   date "1968-09-22",  1800, NULL,  20);
1 row created.
SQL> insert into employees values(5,"Joe",    "P",  "SALESREP",6,   date "1969-08-23",  1900, 1400,  30);
1 row created.
SQL> insert into employees values(6,"Black",  "R",  "MANAGER", 7,   date "1970-07-24",  2000, NULL,  30);
1 row created.
SQL> insert into employees values(7,"Red",    "A",  "MANAGER", 8,   date "1971-06-25",  2100, NULL,  40);
1 row created.
SQL> insert into employees values(8,"White",  "S",  "TRAINER", 9,   date "1972-05-26",  2200, NULL,  40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C",  "DIRECTOR",10,  date "1973-04-27",  2300, NULL,  20);
1 row created.
SQL> insert into employees values(10,"Pink",  "J",  "SALESREP",null,date "1974-03-28",  2400, 0,     30);
1 row created.
SQL>
SQL>
SQL> select empno, ename, comm
  2  from   employees
  3  where  comm > 400;
     EMPNO ENAME          COMM
---------- -------- ----------
         3 Jord            500
         5 Joe            1400
SQL>
SQL> select empno, ename, comm
  2  from   employees
  3  where  comm <= 400;
     EMPNO ENAME          COMM
---------- -------- ----------
         2 Jerry           300
        10 Pink              0
SQL>
SQL>
SQL> drop table employees;
Table dropped.
SQL>
SQL>


Concatenate string

SQL>
SQL>
SQL> create table employees(
  2    empno      NUMBER(4)
  3  , ename      VARCHAR2(8)
  4  , init       VARCHAR2(5)
  5  , job        VARCHAR2(8)
  6  , mgr        NUMBER(4)
  7  , bdate      DATE
  8  , msal       NUMBER(6,2)
  9  , comm       NUMBER(6,2)
 10  , deptno     NUMBER(2) ) ;
Table created.
SQL>
SQL>
SQL> insert into employees values(1,"Jason",  "N",  "TRAINER", 2,   date "1965-12-18",  800 , NULL,  10);
1 row created.
SQL> insert into employees values(2,"Jerry",  "J",  "SALESREP",3,   date "1966-11-19",  1600, 300,   10);
1 row created.
SQL> insert into employees values(3,"Jord",   "T" , "SALESREP",4,   date "1967-10-21",  1700, 500,   20);
1 row created.
SQL> insert into employees values(4,"Mary",   "J",  "MANAGER", 5,   date "1968-09-22",  1800, NULL,  20);
1 row created.
SQL> insert into employees values(5,"Joe",    "P",  "SALESREP",6,   date "1969-08-23",  1900, 1400,  30);
1 row created.
SQL> insert into employees values(6,"Black",  "R",  "MANAGER", 7,   date "1970-07-24",  2000, NULL,  30);
1 row created.
SQL> insert into employees values(7,"Red",    "A",  "MANAGER", 8,   date "1971-06-25",  2100, NULL,  40);
1 row created.
SQL> insert into employees values(8,"White",  "S",  "TRAINER", 9,   date "1972-05-26",  2200, NULL,  40);
1 row created.
SQL> insert into employees values(9,"Yellow", "C",  "DIRECTOR",10,  date "1973-04-27",  2300, NULL,  20);
1 row created.
SQL> insert into employees values(10,"Pink",  "J",  "SALESREP",null,date "1974-03-28",  2400, 0,     30);
1 row created.
SQL>
SQL>
SQL> select ename ||", "||init
  2         as full_name
  3  from   employees;
FULL_NAME
---------------
Jason, N
Jerry, J
Jord, T
Mary, J
Joe, P
Black, R
Red, A
White, S
Yellow, C
Pink, J
10 rows selected.
SQL>
SQL> drop table employees;
Table dropped.


Don"t Perform the Same Calculation Over and Over

SQL>
SQL> CREATE TABLE contract
  2  (income   INTEGER
  3  ,overhead INTEGER);
Table created.
SQL>
SQL>
SQL> INSERT INTO contract VALUES (1000,20);
1 row created.
SQL> INSERT INTO contract VALUES (2000,10);
1 row created.
SQL> INSERT INTO contract VALUES (1000,50);
1 row created.
SQL>
SQL> SELECT income,
  2         overhead,
  3         (income-income*overhead/100) AS residual,
  4         0.20*(income-income*overhead/100) AS Est,
  5         0.10*(income-income*overhead/100) AS Admin,
  6         0.05*(income-income*overhead/100) AS Rsrv
  7    FROM contract;
    INCOME   OVERHEAD   RESIDUAL        EST      ADMIN       RSRV
---------- ---------- ---------- ---------- ---------- ----------
      1000         20        800        160         80         40
      2000         10       1800        360        180         90
      1000         50        500        100         50         25
SQL> SELECT income,
  2         overhead,
  3         residual,
  4         0.20*residual AS Est,
  5         0.10*residual AS Admin,
  6         0.05*residual AS Rsrv
  7    FROM
  8     (SELECT income, overhead, (income-income*overhead/100) AS residual
  9        FROM contract) subquery;
    INCOME   OVERHEAD   RESIDUAL        EST      ADMIN       RSRV
---------- ---------- ---------- ---------- ---------- ----------
      1000         20        800        160         80         40
      2000         10       1800        360        180         90
      1000         50        500        100         50         25
SQL> CREATE VIEW residual1 AS
  2    SELECT income, overhead, (income-income*overhead/100) AS residual
  3      FROM contract;
View created.
SQL>
SQL> SELECT income,
  2         overhead,
  3         residual,
  4         0.20*residual AS Est,
  5         0.10*residual AS Admin,
  6         0.05*residual AS Rsrv
  7    FROM residual1;
    INCOME   OVERHEAD   RESIDUAL        EST      ADMIN       RSRV
---------- ---------- ---------- ---------- ---------- ----------
      1000         20        800        160         80         40
      2000         10       1800        360        180         90
      1000         50        500        100         50         25
SQL> SELECT subquery.*,
  2         0.20*residual AS Est,
  3         0.10*residual AS Admin,
  4         0.05*residual AS Rsrv
  5    FROM
  6     (SELECT contract.*, (income-income*overhead/100) AS residual
  7        FROM contract) subquery;
    INCOME   OVERHEAD   RESIDUAL        EST      ADMIN       RSRV
---------- ---------- ---------- ---------- ---------- ----------
      1000         20        800        160         80         40
      2000         10       1800        360        180         90
      1000         50        500        100         50         25
SQL>
SQL> DROP VIEW residual1;
View dropped.
SQL> DROP TABLE contract;
Table dropped.
SQL>
SQL>


List single column from a table

SQL>
SQL>
SQL>
SQL> CREATE TABLE employees (
  2    au_id    CHAR(3)     NOT NULL,
  3    au_fname VARCHAR(15) NOT NULL,
  4    au_lname VARCHAR(15) NOT NULL,
  5    phone    VARCHAR(12) NULL    ,
  6    address  VARCHAR(20) NULL    ,
  7    city     VARCHAR(15) NULL    ,
  8    state    CHAR(2)     NULL    ,
  9    zip      CHAR(5)     NULL
 10  );
Table created.
SQL>
SQL> INSERT INTO employees VALUES("A01","S","B","111-111-1111","75 St","Boston","NY","11111");
1 row created.
SQL> INSERT INTO employees VALUES("A02","W","H","222-222-2222","2922 Rd","Boston","CO","22222");
1 row created.
SQL> INSERT INTO employees VALUES("A03","H","H","333-333-3333","3800 Ave, #14F","San Francisco","CA","33333");
1 row created.
SQL> INSERT INTO employees VALUES("A04","K","H","444-444-4444","3800 Ave, #14F","San Francisco","CA","44444");
1 row created.
SQL> INSERT INTO employees VALUES("A05","C","K","555-555-5555","114 St","New York","NY","55555");
1 row created.
SQL> INSERT INTO employees VALUES("A06"," ","K","666-666-666","390 Mall","Palo Alto","CA","66666");
1 row created.
SQL> INSERT INTO employees VALUES("A07","P","O","777-777-7777","1442 St","Sarasota","FL","77777");
1 row created.
SQL>
SQL>
SQL>
SQL>
SQL> SELECT city
  2    FROM employees;
CITY
---------------
Boston
Boston
San Francisco
San Francisco
New York
Palo Alto
Sarasota
7 rows selected.
SQL>
SQL> drop table employees;
Table dropped.


Math calculation in select statement

SQL>
SQL>
SQL>
SQL> SELECT 2 + 3 * 4   AS "2+3*4",
  2         (2 + 3) * 4 AS "(2+3)*4",
  3         6 / 2 * 3   AS "6/2*3",
  4         6 / (2 * 3) AS "6/(2*3)" from dual;
     2+3*4    (2+3)*4      6/2*3    6/(2*3)
---------- ---------- ---------- ----------
        14         20          9          1


Negate a column value

SQL>
SQL>
SQL> CREATE TABLE promotion(
  2    title_id     CHAR(3)      NOT NULL,
  3    advance      DECIMAL(9,2) NULL    ,
  4    royalty_rate DECIMAL(5,2) NULL);
Table created.
SQL>
SQL>
SQL> INSERT INTO promotion VALUES("T01",10000,0.05);
1 row created.
SQL> INSERT INTO promotion VALUES("T02",1000,0.06);
1 row created.
SQL> INSERT INTO promotion VALUES("T03",15000,0.07);
1 row created.
SQL> INSERT INTO promotion VALUES("T04",20000,0.08);
1 row created.
SQL> INSERT INTO promotion VALUES("T05",100000,0.09);
1 row created.
SQL> INSERT INTO promotion VALUES("T06",20000,0.08);
1 row created.
SQL> INSERT INTO promotion VALUES("T07",1000000,0.11);
1 row created.
SQL> INSERT INTO promotion VALUES("T08",0,0.04);
1 row created.
SQL> INSERT INTO promotion VALUES("T09",0,0.05);
1 row created.
SQL> INSERT INTO promotion VALUES("T10",NULL,NULL);
1 row created.
SQL> INSERT INTO promotion VALUES("T11",100000,0.07);
1 row created.
SQL> INSERT INTO promotion VALUES("T12",50000,0.09);
1 row created.
SQL> INSERT INTO promotion VALUES("T13",20000,0.06);
1 row created.
SQL>
SQL>
SQL> SELECT title_id,
  2         -advance AS "Advance"
  3    FROM promotion;
TIT    Advance
--- ----------
T01     -10000
T02      -1000
T03     -15000
T04     -20000
T05    -100000
T06     -20000
T07   -1000000
T08          0
T09          0
T10
T11    -100000
TIT    Advance
--- ----------
T12     -50000
T13     -20000
13 rows selected.
SQL>
SQL>
SQL> drop table promotion;
Table dropped.
SQL>
SQL>


NO_INDEX function in select statement

SQL>
SQL>
SQL> CREATE TABLE employee
  2  (employee_id         NUMBER(7),
  3   last_name           VARCHAR2(25),
  4   first_name          VARCHAR2(25),
  5   userid              VARCHAR2(8),
  6   start_date          DATE,
  7   comments            VARCHAR2(255),
  8   manager_id          NUMBER(7),
  9   title               VARCHAR2(25),
 10   department_id       NUMBER(7),
 11   salary              NUMBER(11, 2),
 12   commission_pct      NUMBER(4, 2)
 13  );
Table created.
SQL>
SQL> INSERT INTO employee VALUES (1, "V", "Ben", "cv",to_date("03-MAR-90 8:30", "dd-mon-yy hh24:mi"),NULL, NULL, "PRESIDENT", 50, 2500, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (2, "N", "Haidy", "ln", "08-MAR-90", NULL,1, "VP, OPERATIONS", 41, 1450, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (3, "N", "Molly", "mn", "17-JUN-91",NULL, 1, "VP, SALES", 31, 1400, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (4, "S", "Mark", "mq", "07-APR-90",NULL, 1, "VP, FINANCE", 10, 1450, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (5, "R", "AUDRY", "ar", "04-MAR-90",NULL, 1, "VP, ADMINISTRATION", 50, 1550, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (6, "U", "MOLLY", "mu", "18-JAN-91",NULL, 2, "WAREHOUSE MANAGER", 41, 1200, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (7, "M", "ROBERTA", "rm", "14-MAY-90",NULL, 2, "WAREHOUSE MANAGER", 41, 1250, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (8, "B", "BEN", "ry", "07-APR-90", NULL, 2,"WAREHOUSE MANAGER", 41, 1100, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (9, "C", "Jane", "ac", "09-FEB-92",NULL, 2, "WAREHOUSE MANAGER", 41, 1300, NULL);
1 row created.
SQL> INSERT INTO employee VALUES (10, "H", "Mart", "mh", "27-FEB-91", NULL, 2,"WAREHOUSE MANAGER", 41, 1307, NULL);
1 row created.
SQL>
SQL>
SQL>
SQL> SELECT /*+ NO_INDEX (employee employee_id_pk) */
  2         first_name, last_name
  3  FROM   employee
  4  WHERE  employee_id = 25;
no rows selected
SQL>
SQL>
SQL> drop table employee;
Table dropped.


Performing Single Table SELECT Statements

  1. The SELECT statement retrieves information from tables.
  2. The SELECT statement specifies the table and a list of column names.
  3. After the SELECT keyword, you supply the column names.
  4. After the FROM keyword, you supply the table name.
  5. The SQL statement is ended using a semicolon (;).
  6. The items that immediately follow the SELECT statement can be any valid expressions.
  7. The rows returned by the database are known as a result set.
  8. Oracle database converts the column names into their uppercase equivalents.
  9. Character and date columns are left-justified.
  10. Number columns are right-justified.

By default, the Oracle database displays dates in the format DD-MON-YY, where

  1. DD is the day number,
  2. MON is the first three characters of the month (in uppercase), and
  3. YY is the last two digits of the year.

The clauses of a SELECT statement are:



WITH
SELECT
FROM
WHERE
GROUP BY
HAVING
ORDER BY


Search for String Across Columns

SQL>
SQL> CREATE TABLE myRoom
  2  (name   VARCHAR(10)
  3  ,floorcolor VARCHAR(10)
  4  ,ceilingcolor VARCHAR(10)
  5  ,wallcolor VARCHAR(10)
  6  );
Table created.
SQL> INSERT INTO myRoom VALUES ("Jim","RED","GREEN","YELLOW");
1 row created.
SQL> INSERT INTO myRoom VALUES ("Bob","YELLOW","BLUE","BLACK");
1 row created.
SQL> INSERT INTO myRoom VALUES ("Allan","BLUE","PINK","BLACK");
1 row created.
SQL> INSERT INTO myRoom VALUES ("George","BLUE","GREEN","OAK");
1 row created.
SQL>
SQL> SELECT name FROM myRoom
  2  WHERE floorcolor = "YELLOW"
  3  OR    ceilingcolor = "YELLOW"
  4  OR    wallcolor = "YELLOW";
NAME
----------
Jim
Bob
SQL>
SQL> DROP TABLE myRoom;
Table dropped.
SQL>


Select constant as a column

SQL>
SQL>
SQL>
SQL> CREATE TABLE book(
  2    title_id   CHAR(3)      NOT NULL,
  3    title_name VARCHAR(40)  NOT NULL,
  4    type       VARCHAR(10)  NULL    ,
  5    pub_id     CHAR(3)      NOT NULL,
  6    pages      INTEGER      NULL    ,
  7    price      DECIMAL(5,2) NULL    ,
  8    sales      INTEGER      NULL    ,
  9    pubdate    DATE         NULL    ,
 10    contract   SMALLINT     NOT NULL
 11  );
Table created.
SQL>
SQL>
SQL>
SQL>
SQL> INSERT INTO book VALUES("T01","Java","history","P01",111,21.99,566,DATE "2000-08-01",1);
1 row created.
SQL> INSERT INTO book VALUES("T02","Oracle","history","P03", 114,19.95,9566,DATE "1998-04-01",1);
1 row created.
SQL> INSERT INTO book VALUES("T03","SQL","computer","P02", 122,39.95,25667,DATE "2000-09-01",1);
1 row created.
SQL> INSERT INTO book VALUES("T04","C++","psychology","P04", 511,12.99,13001,DATE "1999-05-31",1);
1 row created.
SQL> INSERT INTO book VALUES("T05","Python","psychology","P04", 101,6.95,201440,DATE "2001-01-01",1);
1 row created.
SQL> INSERT INTO book VALUES("T06","JavaScript","biography","P01", 173,19.95,11320,DATE "2000-07-31",1);
1 row created.
SQL> INSERT INTO book VALUES("T07","LINQ","biography","P03", 331,23.95,1500200,DATE "1999-10-01",1);
1 row created.
SQL> INSERT INTO book VALUES("T08","C#","children","P04", 861,10.00,4095,DATE "2001-06-01",1);
1 row created.
SQL> INSERT INTO book VALUES("T09","SQL Server","children","P04", 212,13.95,5000,DATE "2002-05-31",1);
1 row created.
SQL> INSERT INTO book VALUES("T10","AJAX","biography","P01", NULL,NULL,NULL,NULL,0);
1 row created.
SQL> INSERT INTO book VALUES("T11","VB","psychology","P04", 821,7.99,94123,DATE "2000-11-30",1);
1 row created.
SQL> INSERT INTO book VALUES("T12","Office","biography","P01", 507,12.99,100001,DATE "2000-08-31",1);
1 row created.
SQL> INSERT INTO book VALUES("T13","VBA","history","P03", 812,29.99,10467,DATE "1999-05-31",1);
1 row created.
SQL>
SQL>
SQL>
SQL> SELECT title_id,
  2         price,
  3         0.10 AS "Discount",
  4         price * (1 - 0.10) AS "New price"
  5    FROM book;
TIT      PRICE   Discount  New price
--- ---------- ---------- ----------
T01      21.99         .1     19.791
T02      19.95         .1     17.955
T03      39.95         .1     35.955
T04      12.99         .1     11.691
T05       6.95         .1      6.255
T06      19.95         .1     17.955
T07      23.95         .1     21.555
T08         10         .1          9
T09      13.95         .1     12.555
T10                    .1
T11       7.99         .1      7.191
TIT      PRICE   Discount  New price
--- ---------- ---------- ----------
T12      12.99         .1     11.691
T13      29.99         .1     26.991
13 rows selected.
SQL>
SQL> drop table book;
Table dropped.
SQL>


Select employee first and last and sort by last name

SQL>
SQL> CREATE TABLE employees (
  2    au_id    CHAR(3)     NOT NULL,
  3    au_fname VARCHAR(15) NOT NULL,
  4    au_lname VARCHAR(15) NOT NULL,
  5    phone    VARCHAR(12) NULL    ,
  6    address  VARCHAR(20) NULL    ,
  7    city     VARCHAR(15) NULL    ,
  8    state    CHAR(2)     NULL    ,
  9    zip      CHAR(5)     NULL
 10  );
Table created.
SQL>
SQL> INSERT INTO employees VALUES("A01","S","B","111-111-1111","75 St","Boston","NY","11111");
1 row created.
SQL> INSERT INTO employees VALUES("A02","W","H","222-222-2222","2922 Rd","Boston","CO","22222");
1 row created.
SQL> INSERT INTO employees VALUES("A03","H","H","333-333-3333","3800 Ave, #14F","San Francisco","CA","33333");
1 row created.
SQL> INSERT INTO employees VALUES("A04","K","H","444-444-4444","3800 Ave, #14F","San Francisco","CA","44444");
1 row created.
SQL> INSERT INTO employees VALUES("A05","C","K","555-555-5555","114 St","New York","NY","55555");
1 row created.
SQL> INSERT INTO employees VALUES("A06"," ","K","666-666-666","390 Mall","Palo Alto","CA","66666");
1 row created.
SQL> INSERT INTO employees VALUES("A07","P","O","777-777-7777","1442 St","Sarasota","FL","77777");
1 row created.
SQL>
SQL>
SQL>
SQL> SELECT au_fname, au_lname
  2    FROM employees
  3    ORDER BY au_lname;
AU_FNAME        AU_LNAME
--------------- ---------------
S               B
H               H
W               H
K               H
C               K
                K
P               O
7 rows selected.
SQL>
SQL> drop table employees;
Table dropped.
SQL>


Select from a Subquery

SQL>
SQL>
SQL>
SQL> create table history
  2  ( empno      NUMBER(4)
  3  , beginyear  NUMBER(4)
  4  , begindate  DATE
  5  , enddate    DATE
  6  , deptno     NUMBER(2)
  7  , msal       NUMBER(6,2)
  8  , comments   VARCHAR2(60)
  9  ) ;
Table created.
SQL>
SQL>
SQL>
SQL> insert into history values (9,2000,date "2000-01-01",date "2002-01-02",40, 950,"history for 9");
1 row created.
SQL> insert into history values (8,2000,date "2000-01-02", NULL       ,20, 800,"");
1 row created.
SQL> insert into history values (7,1988,date "2000-01-06",date "2002-01-07",30,1000,"");
1 row created.
SQL> insert into history values (6,1989,date "2000-01-07",date "2002-01-12",30,1300,"");
1 row created.
SQL> insert into history values (5,1993,date "2000-01-12",date "2002-01-10",30,1500,"history for 5");
1 row created.
SQL> insert into history values (4,1995,date "2000-01-10",date "2002-01-11",30,1700,"");
1 row created.
SQL> insert into history values (3,1999,date "2000-01-11", NULL       ,30,1600,"");
1 row created.
SQL> insert into history values (2,1986,date "2000-01-10",date "2002-01-08",20,1000,"history for 2");
1 row created.
SQL> insert into history values (1,1987,date "2000-01-08",date "2002-01-01",30,1000,"history for 1");
1 row created.
SQL> insert into history values (7,1989,date "2000-01-01",date "2002-05-12",30,1150,"history for 7");
1 row created.
SQL>
SQL>
SQL>
SQL> select *
  2  from  (select empno, msal
  3         from   history
  4         order  by msal desc)
  5  where  rownum <= 3;
 EMPNO   MSAL
------ ------
     4   1700
     3   1600
     5   1500
3 rows selected.
SQL>
SQL> drop table history;
Table dropped.
SQL>
SQL>


Use as to specify the alias name

SQL>
SQL> CREATE TABLE employees (
  2    au_id    CHAR(3)     NOT NULL,
  3    au_fname VARCHAR(15) NOT NULL,
  4    au_lname VARCHAR(15) NOT NULL,
  5    phone    VARCHAR(12) NULL    ,
  6    address  VARCHAR(20) NULL    ,
  7    city     VARCHAR(15) NULL    ,
  8    state    CHAR(2)     NULL    ,
  9    zip      CHAR(5)     NULL
 10  );
Table created.
SQL>
SQL> INSERT INTO employees VALUES("A01","S","B","111-111-1111","75 St","Boston","NY","11111");
1 row created.
SQL> INSERT INTO employees VALUES("A02","W","H","222-222-2222","2922 Rd","Boston","CO","22222");
1 row created.
SQL> INSERT INTO employees VALUES("A03","H","H","333-333-3333","3800 Ave, #14F","San Francisco","CA","33333");
1 row created.
SQL> INSERT INTO employees VALUES("A04","K","H","444-444-4444","3800 Ave, #14F","San Francisco","CA","44444");
1 row created.
SQL> INSERT INTO employees VALUES("A05","C","K","555-555-5555","114 St","New York","NY","55555");
1 row created.
SQL> INSERT INTO employees VALUES("A06"," ","K","666-666-666","390 Mall","Palo Alto","CA","66666");
1 row created.
SQL> INSERT INTO employees VALUES("A07","P","O","777-777-7777","1442 St","Sarasota","FL","77777");
1 row created.
SQL>
SQL>
SQL>
SQL> SELECT au_fname AS "First name",
  2         au_lname AS "Last name",
  3         city AS "City",
  4         state,
  5         zip AS "Postal code"
  6  FROM employees;
First name      Last name       City            ST Posta
--------------- --------------- --------------- -- -----
S               B               Boston          NY 11111
W               H               Boston          CO 22222
H               H               San Francisco   CA 33333
K               H               San Francisco   CA 44444
C               K               New York        NY 55555
                K               Palo Alto       CA 66666
P               O               Sarasota        FL 77777
7 rows selected.
SQL>
SQL>
SQL> drop table employees;
Table dropped.


Use function in select clause

The following example displays the absolute value of subtracting 8000 from the salary column.



SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(4 BYTE)         NOT NULL,
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 BYTE)
 10  )
 11  /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2               values ("01","Jason",    "Martin",  to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto",  "Programmer")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("02","Alison",   "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("03","James",    "Smith",   to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("04","Celia",    "Rice",    to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("05","Robert",   "Black",   to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("06","Linda",    "Green",   to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York",  "Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("07","David",    "Larry",   to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York",  "Manager")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("08","James",    "Cat",     to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
  3  /
1 row created.
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
  2  /
ID   FIRST_NAME LAST_NAME  START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- ---------- ---------- --------- --------- ---------- ---------- ---------------
01   Jason      Martin     25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison     Mathews    21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester
03   James      Smith      12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia      Rice       24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert     Black      15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda      Green      30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David      Larry      31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James      Cat        17-SEP-96 15-APR-02    1232.78 Vancouver  Tester
8 rows selected.
SQL>
SQL>
SQL>
SQL> SELECT id, salary, salary - 80000, ABS(salary - 80000) FROM employee;
ID       SALARY SALARY-80000 ABS(SALARY-80000)
---- ---------- ------------ -----------------
01      1234.56    -78765.44          78765.44
02      6661.78    -73338.22          73338.22
03      6544.78    -73455.22          73455.22
04      2344.78    -77655.22          77655.22
05      2334.78    -77665.22          77665.22
06      4322.78    -75677.22          75677.22
07      7897.78    -72102.22          72102.22
08      1232.78    -78767.22          78767.22
8 rows selected.
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /
Table dropped.


Use more than one aggregate functions in a select statement

SQL>
SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(4 BYTE)         NOT NULL primary key,
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 BYTE)
 10  )
 11  /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2               values ("01","Jason",    "Martin",  to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto",  "Programmer")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("02","Alison",   "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("03","James",    "Smith",   to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("04","Celia",    "Rice",    to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("05","Robert",   "Black",   to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("06","Linda",    "Green",   to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York",  "Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("07","David",    "Larry",   to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York",  "Manager")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("08","James",    "Cat",     to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
  3  /
1 row created.
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
  2  /

ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
01   Jason                Martin               25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison               Mathews              21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester
03   James                Smith                12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia                Rice                 24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert               Black                15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda                Green                30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David                Larry                31-DEC-90 12-FEB-98    7897.78 New York   Manager
08   James                Cat                  17-SEP-96 15-APR-02    1232.78 Vancouver  Tester
8 rows selected.
SQL>
SQL>
SQL> select city, avg(salary), sum(salary), max(salary), count(*)
  2  from employee
  3  group by city;

CITY       AVG(SALARY) SUM(SALARY) MAX(SALARY)   COUNT(*)
---------- ----------- ----------- ----------- ----------
New York       6110.28    12220.56     7897.78          2
Toronto        1234.56     1234.56     1234.56          1
Vancouver      3823.78     19118.9     6661.78          5
3 rows selected.
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /
Table dropped.


where clause

SQL>
SQL>
SQL>
SQL> -- create demo table
SQL> create table Employee(
  2    ID                 VARCHAR2(4 BYTE)         NOT NULL primary key,
  3    First_Name         VARCHAR2(10 BYTE),
  4    Last_Name          VARCHAR2(10 BYTE),
  5    Start_Date         DATE,
  6    End_Date           DATE,
  7    Salary             Number(8,2),
  8    City               VARCHAR2(10 BYTE),
  9    Description        VARCHAR2(15 BYTE)
 10  )
 11  /
Table created.
SQL>
SQL> -- prepare data
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2               values ("01","Jason",    "Martin",  to_date("19960725","YYYYMMDD"), to_date("20060725","YYYYMMDD"), 1234.56, "Toronto",  "Programmer")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("02","Alison",   "Mathews", to_date("19760321","YYYYMMDD"), to_date("19860221","YYYYMMDD"), 6661.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("03","James",    "Smith",   to_date("19781212","YYYYMMDD"), to_date("19900315","YYYYMMDD"), 6544.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("04","Celia",    "Rice",    to_date("19821024","YYYYMMDD"), to_date("19990421","YYYYMMDD"), 2344.78, "Vancouver","Manager")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary,  City,       Description)
  2                values("05","Robert",   "Black",   to_date("19840115","YYYYMMDD"), to_date("19980808","YYYYMMDD"), 2334.78, "Vancouver","Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("06","Linda",    "Green",   to_date("19870730","YYYYMMDD"), to_date("19960104","YYYYMMDD"), 4322.78,"New York",  "Tester")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("07","David",    "Larry",   to_date("19901231","YYYYMMDD"), to_date("19980212","YYYYMMDD"), 7897.78,"New York",  "Manager")
  3  /
1 row created.
SQL> insert into Employee(ID,  First_Name, Last_Name, Start_Date,                     End_Date,                       Salary, City,        Description)
  2                values("08","James",    "Cat",     to_date("19960917","YYYYMMDD"), to_date("20020415","YYYYMMDD"), 1232.78,"Vancouver", "Tester")
  3  /
1 row created.
SQL>
SQL>
SQL>
SQL> -- display data in the table
SQL> select * from Employee
  2  /

ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
01   Jason                Martin               25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
02   Alison               Mathews              21-MAR-76 21-FEB-86    6661.78 Vancouver  Tester
03   James                Smith                12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
04   Celia                Rice                 24-OCT-82 21-APR-99    2344.78 Vancouver  Manager
05   Robert               Black                15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
06   Linda                Green                30-JUL-87 04-JAN-96    4322.78 New York   Tester
07   David                Larry                31-DEC-90 12-FEB-98    7897.78 New York   Manager

ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
08   James                Cat                  17-SEP-96 15-APR-02    1232.78 Vancouver  Tester
8 rows selected.
SQL>
SQL> select * from employee
  2       where first_name like "J%";

ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
01   Jason                Martin               25-JUL-96 25-JUL-06    1234.56 Toronto    Programmer
03   James                Smith                12-DEC-78 15-MAR-90    6544.78 Vancouver  Tester
08   James                Cat                  17-SEP-96 15-APR-02    1232.78 Vancouver  Tester
3 rows selected.
SQL> select * from employee where id = 5 and salary > 0
  2      /

ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
05   Robert               Black                15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
SQL>     /

ID   FIRST_NAME           LAST_NAME            START_DAT END_DATE      SALARY CITY       DESCRIPTION
---- -------------------- -------------------- --------- --------- ---------- ---------- ---------------
05   Robert               Black                15-JAN-84 08-AUG-98    2334.78 Vancouver  Tester
SQL>
SQL>
SQL>
SQL> -- clean the table
SQL> drop table Employee
  2  /
Table dropped.