Set operations in SQL is a type of operations which allow the results of multiple queries to be combined into a single result set. Set operators in SQL include UNION, INTERSECT, and EXCEPT, which mathematically correspond to the concepts of union, intersection and set difference.
Set operations in SQL is a type of operations which allow the results of multiple queries to be combined into a single result set. Set operators in SQL include UNION, INTERSECT, and EXCEPT, which mathematically correspond to the concepts of union, intersection and set difference.
Source: Wikipedia "Set operations (SQL)" · CC BY-SA 4.0
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