Set Operators

Set operators combine the results of two component queries into a single result. Queries containing set operators are called compound queries. Table 4-5 lists the SQL set operators. They are fully described with examples in The Set Operators.

Table 4-5 Set Operators

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