select_statement
UNION [ALL | DISTINCT] | {MINUS [DISTINCT] | EXCEPT [DISTINCT]} | INTERSECT [DISTINCT]select_statementThe following example is not valid because the data types of the column expressions are different (salary FROM emp has a different data type than last_name FROM raises). This example does have the same number of column expressions in each Select statement but the expressions are not in the same order by data type.
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