![]() Write a query to retrieve distinct cities from the Employees and Projects table. SQL UNION Examples UNION Operator Example ![]() Examples of SQL UNION and UNION ALLįor your better understanding, I will be considering the following tables to show you different examples. Next, in this article on SQL UNION, let us understand the different ways to use this operator. Moving on in this article, let us understand the differences between UNION and UNION ALL.ĭifferences between SQL UNION and UNION ALLĬombines two or more result set and does not keep the duplicate values.Ĭombines two or more result set and keeps the duplicate values. Moving on in this article on SQL UNION, let us understand the syntax. Just in case, you want duplicate values, then you have to use the UNION ALL clause. The UNION clause gives only unique values as output. Also, all the columns present in the SELECT statements must have similar data types. ![]() Here each SELECT statement used within the UNION statement must have the same number of columns in the same order. Let us get started! What is the SQL UNION operator?Īs the name suggests, this operator/ clause is used to combine the results of two or more SELECT statements. Differences between UNION and UNION ALL.In this article on SQL UNION, I will discuss the UNION operator used to retrieve data in the following sequence: While handling data in databases, we often tend to use the set operators in SQL, to retrieve data according to our requirements by combining two or more SELECT statements.
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