Web Reference: May 6, 2024 · Find out everything you need to know about the SQL UNION operator, from syntax to use cases, and learn how it differs from UNION ALL. Jan 6, 2026 · The UNION clause simplifies querying across multiple tables, allowing developers to merge data effectively. In this article, we will discuss the syntax, examples, and use cases of the UNION clause, along with explanations and outputs for better understanding. There are (at least) three ways to combine results of queries in SQL: JOIN, UNION, and INTERSECT. They serve different purposes: Use UNION when you want to add more rows to your results. Use JOIN to add more columns to your results. Use INTERSECT when you want to find the common set of rows between tables.
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