Set Operators

Set operators combine the results of two component queries into a single result. Queries containing set operators are called compound queries. Table 4-4 lists SQL set operators. They are fully described, including examples and restrictions on these operators, in "The UNION [ALL], INTERSECT, MINUS Operators".

Table 4-4 Set Operators

Operator	Returns
`UNION`	All distinct rows selected by either query
`UNION ALL`	All rows selected by either query, including all duplicates
`INTERSECT`	All distinct rows selected by both queries
`MINUS`	All distinct rows selected by the first query but not the second