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  The UNION operator is used to JOIN the result-set of two or more two selected statements. Using UNION, multiple SELECT statements can be described, and their results can be combined into a single result set. Each query in a UNION must include the same columns, expressions or combined ...

Set Operations Set operations is used to merge query results by combining two or more queries into a particular single result.  SQL support three set operators which have the proper pattern.  <query 1> <set operators> <query 2> Union  The UNION command is ...