Union operator is used to combine many SEECT queries. The result will be all records fetched by all queries. Each SELECT statement within the UNION must have the same number of columns. The columns must also have similar data types. Also the columns in each SELECT statement must be in the same order.
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March 22, 2015 at 2:30 pm
Union operator is used to combine many SEECT queries. The result will be all records fetched by all queries. Each SELECT statement within the UNION must have the same number of columns. The columns must also have similar data types. Also the columns in each SELECT statement must be in the same order.
March 23, 2015 at 11:46 pm
the purpose of using union is to combine multiple tables with similarities
March 24, 2015 at 8:12 pm
to combine the results of two or more select statements, by doing this it removes duplicate rows
– Tomiwa
March 28, 2015 at 6:56 pm
The SQL UNION operator combines the result of two or more SELECT statements.
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