The 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 UNION Syntax SELECT column_name(s) FROM table1 UNION SELECT column_name(s) FROM table2; UNION ALL Syntax The UNION operator Syntax The UNION operator...