SQL INTERSECT with Multiple Tables

SQL INTERSECT with Multiple Tables is a SQL statement in the Set Operations category. INTERSECT can chain multiple queries to find values common to all result sets. The syntax is SELECT col FROM t1 INTERSECT SELECT col FROM t2 INTERSECT SELECT col FROM t3;. It returns common values result. A close relative is UNION, which combines results from two queries, removing duplicate rows. Each SELECT must have the same number of columns. A close relative is UNION ALL, which like UNION but does NOT remove duplicate rows. Faster because no dedup is needed. A close relative is INTERSECT, which returns rows that appear in BOTH query results. Supported in PostgreSQL, SQL Server, Oracle. More about this category: Set-based operations — UNION, UNION ALL, INTERSECT, EXCEPT. Related Set Operations entries: UNION, UNION ALL, INTERSECT, EXCEPT / MINUS, INTERSECT ALL / EXCEPT ALL, Ordering Set Operations, TABLE Keyword, Set Operation Precedence.