1. SQL Language Reference
  2. Operators
  3. Set Operators

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 SQL set operators. They are fully described, including examples and restrictions on these operators, in The UNION [ALL], INTERSECT, MINUS 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 all duplicates

INTERSECT

All distinct rows selected by both queries

MINUS

All distinct rows selected by the first query but not the second