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Use Union Query To Combine Multiple. It is use to merge the result of two SELECT statement and multiple value as single value. The first query is a primary table and the second query is a related table.
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Just like above example now in place of union we write union all and see the difference in result set. The UNION operator is used to combine the data from the result of two or more SELECT command queries into a single distinct result set. Create a union query by creating and combining select queries.
The syntax is quite simple we combine the select queries of the individual tables with a UNION or UNION ALL.
If doing a UNION ALL then do a SELECT DISTINCT on the OUTER SQL. The SQL UNION Operator The UNION operator is used to combine the result-set of two or more SELECT statements. The data types must be compatible. First the number and the orders of columns that appear in all SELECT statements must be the same.
