SQL Union
Combine result sets.
SQL UNION Operator
The UNION operator is used to combine the result-set of two or more SELECT statements.
- Every SELECT statement within UNION must have the same number of columns
- The columns must also have similar data types
- The columns in every SELECT statement must also be in the same order
The UNION operator selects only distinct values by default. To allow duplicate values, use UNION ALL.
Syntax
SELECT column_name(s) FROM table1
UNION
SELECT column_name(s) FROM table2;