use of intersect in sql code example

Example 1: what is intersect in sql

The SQL INTERSECT clause/operator is used to combine two SELECT statements,
but returns rows only from the first SELECT statement 
that are identical to a row in the second SELECT statement.
This means INTERSECT returns only common rows returned by the two 
SELECT statements.

Example 2: intersect sql

INTERSECT:
BASICALLY INTERSECT COMBINES COMMON
ELEMENTS OF BOTH TABLES