The UNION operator is used to combine the result-set of two or more SELECT statements. The UNION operator automatically removes duplicate rows from the result set.

Sep 25, 2018 · This article provides overview of the SQL UNION operator, along with examples and explore some common questions like the differences between UNION vs UNION ALL.

Dec 31, 2019 · Visualize how SQL is joining two tables using a Union All join. See animated visualizations of the data being Unioned in SQL. Learn more.

Aug 4, 2025 · All rows returned from either SELECT statement are combined into the result of the UNION expression. For examples, see SELECT examples. Note The Diagram pane can only …

Nov 17, 2025 · The SQL UNION operator is used to combine the result sets of two or more SELECT queries into a single output. It removes duplicate rows and returns only unique …

The UNION operator in SQL selects fields from two or more tables. In this tutorial, you will learn about the SQL UNION operator with the help of examples.

Jun 24, 2021 · Here we explore the meaning and use of the SQL set operators. The SQL UNION Operation The Venn diagram above a graphical representation of the overlap between two …

Apr 6, 2023 · The diagram shows two tables: left and right, and performing a UNION returns all records in each table. If two records are identical, UNION only returns them once.

As part of SQL’s data manipulation language (DML), UNION is a must-know for anyone working with relational databases. In this blog, we’ll explore the UNION operator in depth, covering its …

Dec 16, 2014 · Basic rules for combining two or more queries using UNION: 1.) the number of columns must be the same. 2.) it must be the same or compatible. 3.) Usually returned column …