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

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.

Dec 6, 2024 · The SQL UNION operator is a powerful tool for combining multiple SELECT statements into one result set. Whether you need to eliminate duplicates or include them, UNION and UNION ALL provide flexible options for aggregating data from multiple tables.

In this syntax, you use the UNION operator to connect the first query with the second one. Here are some rules for using the UNION operator: Same number of columns: The SELECT statements must have the same number of columns. Compatible data types: The corresponding columns in each SELECT statement must have compatible data types.

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.

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 the "Suppliers" table: The UNION ALL command combines the result set of two or more SELECT statements (allows duplicate values).

UNION is a statement or operator that allows you to join 2 or more SELECT by concatenating the results of execution into a single result set.

Oct 1, 2024 · UNION. 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.

UNION is an operator which combines the resultset of two or more SELECT queries into a single resultset. It is a set operation and is different from joining two tables with JOIN. The UNION operator combines the rows of the participating tables while JOIN combines the columns of the participating tables on a condition.

Nov 10, 2019 · For this guide we’ll discuss the UNION Operator section of the SQL statement. The UNION Operator is used to combine the results of multiple select statements into one result set. The SQL statements must have the same number of columns in their Select Statement. SQL Statement. Output. 2 rows in set (0.00 sec) SQL Statement. Output.