Sep 8, 2025 · In SQL, UNION and UNION ALL are used to combine results from multiple SELECT statements. UNION returns only unique rows, whereas UNION ALL includes all rows, keeping …

Sep 8, 2008 · The UNION ALL command is equal to the UNION command, except that UNION ALL selects all values. The difference between Union and Union all is that Union all will not eliminate …

May 28, 2021 · This article compares UNION vs. UNION ALL in SQL, showing the key differences between the two using clear explanations and practical examples.

Learn the difference between SQL UNION and UNION ALL with clear examples, when to use each, performance tips, and common pitfalls. Perfect for beginners and interview prep.

The UNION command combines the result set of two or more SELECT statements (only distinct values) The following SQL statement returns the cities (only distinct values) from both the "Customers" and …

Jul 19, 2024 · As you will see, understanding the subtle differences between UNION and UNION ALL functions in SQL is imperative for efficient data querying and management. This tutorial explains their …

SQL UNION and UNION ALL operators combine rows from multiple tables into a single result set. UNION returns only distinct rows, while UNION ALL returns all rows, including duplicates.

Oct 29, 2019 · In this tip we will take a look at the how to use UNION vs. UNION ALL commands and how they differ. In SQL Server you have the ability to combine multiple datasets into one …

Nov 18, 2025 · 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. A …

SQL provides the UNION, UNION ALL, and UNION DISTINCT operators to allow you to combine multiple SELECT statements into a single result set. While they may sound similar, there are …