A correlated subquery: the subquery references a column from a table referred to in the parent statement. : Correlated Subquery « Query Select « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Query Select » Correlated Subquery 
2. 37. 3. A correlated subquery: the subquery references a column from a table referred to in the parent statement.
SQL>
SQL> CREATE TABLE EMP(
  2      EMPNO NUMBER(4NOT NULL,
  3      ENAME VARCHAR2(10),
  4      JOB VARCHAR2(9),
  5      MGR NUMBER(4),
  6      HIREDATE DATE,
  7      SAL NUMBER(72),
  8      COMM NUMBER(72),
  9      DEPTNO NUMBER(2)
 10  );

Table created.



SQL> INSERT INTO EMP VALUES(2'Jack', 'Tester', 6,TO_DATE('20-FEB-1981', 'DD-MON-YYYY'), 160030030);

row created.

SQL> INSERT INTO EMP VALUES(3'Wil', 'Tester', 6,TO_DATE('22-FEB-1981', 'DD-MON-YYYY'), 125050030);

row created.

SQL> INSERT INTO EMP VALUES(4'Jane', 'Designer', 9,TO_DATE('2-APR-1981', 'DD-MON-YYYY'), 2975, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES(5'Mary', 'Tester', 6,TO_DATE('28-SEP-1981', 'DD-MON-YYYY'), 1250140030);

row created.

SQL> INSERT INTO EMP VALUES(6'Black', 'Designer', 9,TO_DATE('1-MAY-1981', 'DD-MON-YYYY'), 2850, NULL, 30);

row created.

SQL> INSERT INTO EMP VALUES(7'Chris', 'Designer', 9,TO_DATE('9-JUN-1981', 'DD-MON-YYYY'), 2450, NULL, 10);

row created.

SQL> INSERT INTO EMP VALUES(8'Smart', 'Helper', 4,TO_DATE('09-DEC-1982', 'DD-MON-YYYY'), 3000, NULL, 20);

row created.

SQL> INSERT INTO EMP VALUES(9'Peter', 'Manager', NULL,TO_DATE('17-NOV-1981', 'DD-MON-YYYY'), 5000, NULL, 10);

row created.

SQL> INSERT INTO EMP VALUES(10'Take', 'Tester', 6,TO_DATE('8-SEP-1981', 'DD-MON-YYYY'), 1500030);

row created.



SQL> INSERT INTO EMP VALUES(13'Fake', 'Helper', 4,TO_DATE('3-DEC-1981', 'DD-MON-YYYY'), 3000, NULL, 20);

row created.



SQL>
SQL> CREATE TABLE DEPT(
  2      DEPTNO NUMBER(2),
  3      DNAME VARCHAR2(14),
  4      LOC VARCHAR2(13)
  5  );

Table created.

SQL>
SQL> INSERT INTO DEPT VALUES (10'ACCOUNTING', 'NEW YORK');

row created.

SQL> INSERT INTO DEPT VALUES (20'RESEARCH', 'DALLAS');

row created.

SQL> INSERT INTO DEPT VALUES (30'SALES', 'CHICAGO');

row created.

SQL> INSERT INTO DEPT VALUES (40'OPERATIONS', 'BOSTON');

row created.

SQL>
SQL>
SQL> SELECT deptno, ename, sal
  2      FROM   emp e1
  3      WHERE  sal = (SELECT MAX(salFROM emp
  4                       WHERE  deptno = e1.deptno)
  5
SQL> drop table emp;

Table dropped.

SQL> drop table dept;

Table dropped.

SQL>
2. 37. Correlated Subquery
2. 37. 1. Writing Correlated Subqueries
2. 37. 2. Using EXISTS and NOT EXISTS with a Correlated Subquery
2. 37. 3. A correlated subquery: the subquery references a column from a table referred to in the parent statement.
2. 37. 4. The subquery returning the literal value 1
2. 37. 5. Using NOT EXISTS with a Correlated Subquery
2. 37. 6. list all employees who is younger than Joe
2. 37. 7. List all employees who attended XML course and Java course
2. 37. 8. Extract a Subset of the Results
2. 37. 9. How Many Products By Department with correlated subqueries 1
2. 37. 10. How Many Products By Department with correlated subqueries 2
2. 37. 11. Correlated subquery using the EXISTS operator
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