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.

In this article, you'll learn what a SQL union is, how it works, and how you can use it to optimize your database queries. Top experts in this article Selected by the community from 7 contributions.

Read this SQL tutorial to learn when to use SELECT, JOIN, subselects and UNION to access multiple tables with a single statement. It’s sometimes difficult to know which SQL syntax to use when ...

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 ...

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