exists in subquery
SQL>
SQL> create table emp
2 ( empno NUMBER(4) constraint E_PK primary key
3 , ename VARCHAR2(8)
4 , init VARCHAR2(5)
5 , job VARCHAR2(8)
6 , mgr NUMBER(4)
7 , bdate DATE
8 , sal NUMBER(6,2)
9 , comm NUMBER(6,2)
10 , deptno NUMBER(2) default 10
11 ) ;
Table created.
SQL> insert into emp values(1,'Tom','N', 'TRAINER', 13,date '1965-12-17', 800 , NULL, 20);
1 row created.
SQL> insert into emp values(2,'Jack','JAM', 'Tester',6,date '1961-02-20', 1600, 300, 30);
1 row created.
SQL> insert into emp values(3,'Wil','TF' , 'Tester',6,date '1962-02-22', 1250, 500, 30);
1 row created.
SQL> insert into emp values(4,'Jane','JM', 'Designer', 9,date '1967-04-02', 2975, NULL, 20);
1 row created.
SQL> insert into emp values(5,'Mary','P', 'Tester',6,date '1956-09-28', 1250, 1400, 30);
1 row created.
SQL> insert into emp values(6,'Black','R', 'Designer', 9,date '1963-11-01', 2850, NULL, 30);
1 row created.
SQL> insert into emp values(7,'Chris','AB', 'Designer', 9,date '1965-06-09', 2450, NULL, 10);
1 row created.
SQL> insert into emp values(8,'Smart','SCJ', 'TRAINER', 4,date '1959-11-26', 3000, NULL, 20);
1 row created.
SQL> insert into emp values(9,'Peter','CC', 'Designer',NULL,date '1952-11-17', 5000, NULL, 10);
1 row created.
SQL> insert into emp values(10,'Take','JJ', 'Tester',6,date '1968-09-28', 1500, 0, 30);
1 row created.
SQL> insert into emp values(11,'Ana','AA', 'TRAINER', 8,date '1966-12-30', 1100, NULL, 20);
1 row created.
SQL> insert into emp values(12,'Jane','R', 'Manager', 6,date '1969-12-03', 800 , NULL, 30);
1 row created.
SQL> insert into emp values(13,'Fake','MG', 'TRAINER', 4,date '1959-02-13', 3000, NULL, 20);
1 row created.
SQL> insert into emp values(14,'Mike','TJA','Manager', 7,date '1962-01-23', 1300, NULL, 10);
1 row created.
SQL> create table offerings
2 ( course VARCHAR2(6)
3 , begindate DATE
4 , trainer NUMBER(4)
5 , location VARCHAR2(8)
6 ) ;
Table created.
SQL> insert into offerings values ('SQL',date '2009-04-12',13,'DALLAS' );
1 row created.
SQL> insert into offerings values ('OAU',date '2009-08-10',4,'CHICAGO');
1 row created.
SQL> insert into offerings values ('SQL',date '2009-10-04',1,'SEATTLE');
1 row created.
SQL> insert into offerings values ('SQL',date '2009-12-13',1,'DALLAS' );
1 row created.
SQL> insert into offerings values ('JAV',date '2009-12-13',4,'SEATTLE');
1 row created.
SQL> insert into offerings values ('XML',date '2000-02-03',1,'DALLAS' );
1 row created.
SQL> insert into offerings values ('JAV',date '2000-02-01',11,'DALLAS' );
1 row created.
SQL> insert into offerings values ('PLS',date '2000-09-11',8,'DALLAS' );
1 row created.
SQL> insert into offerings values ('XML',date '2000-09-18',NULL,'SEATTLE');
1 row created.
SQL> insert into offerings values ('OAU',date '2000-09-27',13,'DALLAS' );
1 row created.
SQL> insert into offerings values ('ERM',date '2001-01-15',NULL, NULL );
1 row created.
SQL> insert into offerings values ('PRO',date '2001-02-19',NULL,'DALLAS' );
1 row created.
SQL> insert into offerings values ('RSD',date '2001-02-24',8,'CHICAGO');
1 row created.
SQL>
SQL> select e.*
2 from emp e
3 where exists (select o.*
4 from offerings o
5 where o.course = 'SQL'
6 and o.trainer = e.empno);
EMPNO ENAME INIT JOB MGR BDATE SAL COMM
---------- -------- ----- -------- ---------- ---------- ---------- ----------
DEPTNO
----------
1 Tom N TRAINER 13 17-12-1965 800
20
13 Fake MG 4 13-02-1959 3000
20
SQL> drop table offerings;
Table dropped.
SQL> drop table emp;
Table dropped.
SQL>
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