How can I use the UNION Operator?

The UNION operator is used to combine the result-set of two or more SELECT statements. 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. Syntax for UNION : SELECT column_name(e)FROM Table_name1 UNION SELECT column_name(e) FROM table_name2 SQL UNION ALL Syntax SELECT column_name(e) FROM table_name1 UNION ALL SELECT column_name(e) FROM table_name2