The syntax for the Union vs Union All operators in SQL is as follows: The intersections of the shapes, where the tables overlap, are the rows where a condition is met. Note: It is very easy to visualize a set operator using a Venn diagram, where each of the tables is represented by intersecting shapes. List the non-common rows from the first set. The SQL equivalent of the above data is given below In this operation, it combines two more queries and removes the duplicates.įor example, the table ‘A’ has 1,2, and 3 and the table ‘B’ has 3,4,5. 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. There are four basic Set Operators in SQL Server: Let’s get into the details of Set Operators in SQL Server, and how to use them How to use SQL Union with GROUP and HAVING clausesĪn operator is a symbol or a keyword defines an action that is performed on one or more expressions in the Select statement. How to use SQL Union with the queries that have a WHERE clause and order by clause
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