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SET OPERATORS:
-------------
1. UNION -->It display the only uniq records.
2. UNION ALL -->It display the all the records from both the tables.
3. INTERSECT -->It display the common records from both the tables.
4. MINUS -->It will minus the common records from first table and display the remaining first
table records.
DM1
---
CMOB CNAME
1 A
2 B
3 C
4 D
5 E
DM2
---
CMOB CNAME
6 F
7 G
8 H
1 A
3 C
SQL> CREATE TABLE DM1
2 (CMOB NUMBER(10),
3 CNAME VARCHAR2(10));
Table created.
SQL> INSERT INTO DM1 VALUES(1, 'A');
1 row created.
SQL> INSERT INTO DM1 VALUES(2, 'B');
1 row created.
SQL> INSERT INTO DM1 VALUES(3, 'C');
1 row created.
SQL> INSERT INTO DM1 VALUES(4, 'D');
1 row created.
SQL> INSERT INTO DM1 VALUES(5, 'E');
1 row created.
SQL> CREATE TABLE DM2
2 (CMOB NUMBER(10),
3 CNAME VARCHAR2(10));
Table created.
SQL> INSERT INTO DM2 VALUES(6, 'F');
1 row created.
SQL> INSERT INTO DM2 VALUES(7, 'G');
1 row created.
SQL> INSERT INTO DM2 VALUES(8, 'H');
1 row created.
SQL> INSERT INTO DM2 VALUES(1, 'A');
1 row created.
SQL> INSERT INTO DM2 VALUES(3, 'C');
1 row created.
SQL> SELECT * FROM DM1;
CMOB CNAME
---------- ----------
1 A
2 B
3 C
4 D
5 E
SQL> SELECT * FROM DM2;
CMOB CNAME
---------- ----------
6 F
7 G
8 H
1 A
3 C
SQL> SELECT * FROM DM1
2 UNION
3 SELECT * FROM DM2;\
4
SQL> SELECT * FROM DM1
2 UNION
3 SELECT * FROM DM2;
CMOB CNAME
---------- ----------
1 A
2 B
3 C
4 D
5 E
6 F
7 G
8 H
8 rows selected.
SQL> SELECT * FROM DM1
2 UNION ALL
3 SELECT * FROM DM2;
CMOB CNAME
---------- ----------
1 A
2 B
3 C
4 D
5 E
6 F
7 G
8 H
1 A
3 C
10 rows selected.
SQL> SELECT * FROM DM1
2 INTERSECT
3 SELECT * FROM DM2;
CMOB CNAME
---------- ----------
1 A
3 C
SQL> SELECT * FROM DM1
2 MINUS
3 SELECT * FROM DM2;
CMOB CNAME
---------- ----------
2 B
4 D
5 E
SQL> SELECT * FROM DM2
2 MINUS
3 SELECT * FROM DM2;
no rows selected
SQL> ED
Wrote file afiedt.buf
1 SELECT * FROM DM2
2 MINUS
3* SELECT * FROM DM1
SQL> /
CMOB CNAME
---------- ----------
6 F
7 G
8 H
SQL> SELECT * FROM EMP;
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
---------- ---------- --------- ---------- --------- ---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-80 800 20
7499 ALLEN SALESMAN 7698 20-FEB-81 1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81 1250 500 30
7566 JONES MANAGER 7839 02-APR-81 2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81 1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7782 CLARK MANAGER 7839 09-JUN-81 2450 10
7788 SCOTT ANALYST 7566 19-APR-87 3000 20
7839 KING PRESIDENT 17-NOV-81 5000 10
7844 TURNER SALESMAN 7698 08-SEP-81 1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87 1100 20
7900 JAMES CLERK 7698 03-DEC-81 950 30
7902 FORD ANALYST 7566 03-DEC-81 3000 20
7934 MILLER CLERK 7782 23-JAN-82 1300 10
14 rows selected.
SQL> SELECT ENAME FROM EMP WHERE DEPTNO=10
2 UNION ALL
3 SELECT JOB FROM EMP WHERE DEPTNO=10;
ENAME
----------
CLARK
KING
MILLER
MANAGER
PRESIDENT
CLERK
6 rows selected.
SQL> SELECT ENAME FROM EMP WHERE DEPTNO=10
2 UNION
3 SELECT JOB FROM EMP WHERE DEPTNO=10;
ENAME
----------
CLARK
CLERK
KING
MANAGER
MILLER
PRESIDENT
6 rows selected.
SQL> SELECT ENAME FROM EMP WHERE DEPTNO=10
2 UNION ALL
3 SELECT JOB FROM EMP WHERE DEPTNO=30;
ENAME
----------
CLARK
KING
MILLER
SALESMAN
SALESMAN
SALESMAN
MANAGER
SALESMAN
CLERK
9 rows selected.
SQL> ED
Wrote file afiedt.buf
1 SELECT ENAME FROM EMP WHERE DEPTNO=10
2 UNION
3* SELECT JOB FROM EMP WHERE DEPTNO=30
SQL> /
ENAME
----------
CLARK
CLERK
KING
MANAGER
MILLER
SALESMAN
6 rows selected.
SQL> SELECT ENAME FROM EMP WHERE DEPTNO=10
2 UNION ALL
3 SELECT SAL FROM EMP WHERE DEPTNO=10;
SELECT ENAME FROM EMP WHERE DEPTNO=10
*
ERROR at line 1:
ORA-01790: expression must have same datatype as corresponding expression
SQL> SELECT ENAME, SAL FROM EMP WHERE DEPTNO=10
2 UNION ALL
3 SELECT SAL FROM EMP WHERE DEPTNO=10;
SELECT ENAME, SAL FROM EMP WHERE DEPTNO=10
*
ERROR at line 1:
ORA-01789: query block has incorrect number of result columns
SQL> SELECT ENAME, SAL FROM EMP WHERE DEPTNO=10
2 UNION ALL
3 SELECT SAL, ENAME FROM EMP WHERE DEPTNO=10;
SELECT ENAME, SAL FROM EMP WHERE DEPTNO=10
*
ERROR at line 1:
ORA-01790: expression must have same datatype as corresponding expression
SQL> SELECT JOB FROM EMP WHERE DEPTNO=10
2 UNION ALL
3 (SELECT JOB FROM EMP WHERE DEPTNO=20
4 MINUS
5 SELECT JOB FROM EMP WHERE DEPTNO=30)
6 UNION ALL
7 SELECT ENAME FROM EMP WHERE DEPTNO=10;
JOB
----------
MANAGER
PRESIDENT
CLERK
ANALYST
CLARK
KING
MILLER
7 rows selected.
SQL>
