In MySQL UNION operator used to combine the result of multiple SELECT statements. When we apply the UNION operator then it selects only distinct values by default (No duplicate values are allowed).

The SET Operators in MySQL are basically used to combine the result of more than 1 select statement and return the output as a single result set. In SQL, 4 types of set operators are. They are as ...

Why does the order of the SELECT statements in the UNION affect the result?<BR><BR>This first SQL produces the result I want.<BR><BR>SELECT cat_id AS catid, manufacturer AS mfr, model, a_class_id as ...

Joins and unions are two distinct methods for combining data from multiple tables, but they operate differently and are used in different scenarios. -Returns all rows from the left table and matching ...