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MySQL Union
The UNION operator is used to combine the result-set of two or more SELECT statements. Notice that 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.
MySQL UNION Syntax
SELECT column_name(s) FROM table_name1
UNION
SELECT column_name(s) FROM table_name2
Note: The UNION operator selects only distinct values by default. To allow duplicate values, use UNION ALL.
MySQL UNION ALL Syntax
SELECT column_name(s) FROM table_name1
UNION ALL
SELECT column_name(s) FROM table_name2
The column names in the result-set of a UNION are always equal to the column names in the first SELECT statement in the UNION.
