To aggregate the results of two or more SELECT operations, use the UNION operator. Within UNION, every SELECT statement must have the same amount of columns. The data types in the columns must also be similar.
The Union operator joins the results of two or more searches into a single result set that contains all of the rows from all of the Union's inquiries. It combines two more searches and removes duplicates in this operation. Tables 'A' and 'B', for example, have 1,2, and 3, while table 'C' has 3,4,5.
The UNION operator in SQL Server is used to join the results of two or more SELECT statements. Between the several SELECT statements, it removes duplicate rows. In the result sets, each SELECT statement within the UNION operator must have the same number of columns with similar data types.
Union is faster since it just passes the first SELECT command, parses the second, and adds the results to the end of the output table.
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