The UNION ALL operator is used to combine the result-set of two or more SELECT statements. The UNION ALL operator includes all rows from each statement, including any duplicates.

Nov 17, 2025 · UNION ALL Operator is used to combine the results of two or more SELECTstatements into a single result set. Unlike the UNION operator, which eliminates …

This SQL tutorial explains how to use the SQL UNION ALL operator with syntax and examples. The SQL UNION ALL operator is used to combine the result sets of 2 or more SELECT …

Jul 21, 2025 · If you've ever needed to combine the results of multiple SQL queries into one list, UNION is your tool. It’s simple but powerful — UNION removes duplicates, while UNION ALL …

Nov 18, 2025 · The following examples use UNION to combine the results of the same table to demonstrate the effects of ALL and parentheses when using UNION. The first example uses …

Oct 15, 2025 · The UNION ALL operator in SQL is used to combine the results of two or more SELECT statements into a single output but does not remove duplicate records. It simply …

What Is the SQL UNION ALL Operator? The UNION ALL operator combines the result sets of two or more SELECT statements into a single result set, preserving all rows, including duplicates.

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.

Sep 20, 2016 · Switch to UNION ALL, and you’d keep all matching rows without trimming anything. So basically, UNION and UNION ALL are both great for combining data, but they fit …

May 13, 2023 · UNION ALL clause is used to combine/merge the result of multiple SELECT statements into a single result by keeping duplicate rows. While using UNION ALL clause, …