INTERSECTION

Description

Perform an intersection between two row sources

Versions

This operation is implemented in the following versions

Example

This example was developed using Oracle 9.2.0.1 on Windows 2000

This example requires the following table definition

    CREATE TABLE t1 (c1 NUMBER);
    CREATE TABLE t2 (c1 NUMBER);

The table does not need to be analysed

The statement

    SELECT c1 FROM t1
    INTERSECT
    SELECT c1 FROM t2;

generates the following execution plan

0     SELECT STATEMENT Optimizer=CHOOSE
1   0   INTERSECTION
2   1     SORT (UNIQUE)
3   2       TABLE ACCESS (FULL) OF 'T1'
4   1     SORT (UNIQUE)
5   4       TABLE ACCESS (FULL) OF 'T2'