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
UNION Syntax
SELECT column_name(s) FROM table1
UNION
SELECT column_name(s) FROM table2;
UNION
SELECT column_name(s) FROM table2;
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