Learn how to use the UNION operator in SQL, a set operation that combines the rows from two or more queries into one result set. Discover the benefits, limitations, and examples of using it.

Concatenates the results of two queries into a single result set. You control whether the result set includes duplicate rows: UNION ALL - Includes duplicates. UNION - Excludes duplicates. The order of ...

UNION Operator Understand how to merge the results of multiple SELECT statements into a single result set. union_operator.sql. Data Manipulation Explore queries for inserting, updating, and deleting ...

Columns that do not match by name are excluded from the result table, except for the OUTER UNION operator. See OUTER UNION. For example, when performing a set operation on two table-expressions, PROC ...