The SQL UNION Operator. The UNION operator is used to combine the result-set of two or more SELECT statements. Every SELECT statement within UNION must have the same number of columns; The columns must also have similar data types; The columns in every SELECT statement must also be in the same order; UNION Syntax

Use the UNION operator to combine result sets from two queries into a single result set. The UNION operator removes duplicate rows from the final result set. Use the UNION ALL operator to retain the duplicate rows.

Dec 6, 2024 · The SQL UNION operator combines the result sets of two or more SELECT queries. UNION returns unique rows, eliminating duplicate entries from the result set. UNION ALL includes all rows, including duplicate rows.

Mar 10, 2021 · 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 UNION operation is different from a JOIN: A UNION concatenates result sets from two queries.

Sep 25, 2018 · The Union operator combines the results of two or more queries into a distinct single result set that includes all the rows that belong to all queries in the Union. In this operation, it combines two more queries and removes the duplicates.

May 6, 2024 · In standard SQL, the UNION operator combines the results of two or more [SELECT statements] into a single result set. In other words, the UNION SQL operator merges the results of multiple queries into a single result set if they have the same structure. Thus, the result sets to be merged must have the same number of.

Summary: in this tutorial, you will learn how to use the SQL Server UNION to combine the results of two or more queries into a single result set.

Discover the power of SQL Union for combining multiple SQL queries into one. Learn the benefits & step-by-step process of using SQL Union with examples. When working with databases, it's common to need to combine data from multiple tables into a single result set.

Dec 25, 2024 · The SQL UNION operator combines results from multiple SELECT statements into a single result set. This powerful feature allows you to merge data from different tables or queries while eliminating duplicates.

Oct 1, 2024 · The SQL UNION operator combines the results of two or more queries and makes a result set which includes fetched rows from the participating queries in the UNION. Basic rules for combining two or more queries using UNION : 1.) number of columns and order of columns of all queries must be same.