INTERSECT 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 that it returns only common rows returned by the two SELECT statements.

SELECT column_name(s) FROM table1

INTERSECT

SELECT column_name(s) FROM table2;

For instance, we might want to know what brands in our newly acquired store are also in our legacy store. We can do so using the following query:

SELECT brand FROM new_products

INTERSECT

SELECT brand FROM legacy_products;