To perform a difference operation on two tables,the tables do not have to be union compatible.

Name: To perform a difference operation on two tables,the tables do not have to be union compatible.
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To perform a difference operation on two tables (such as in SQL's EXCEPT or MINUS operation), the tables must be union compatible, meaning they must have the same number of columns and corresponding columns must have compatible data types.

To Perform a Difference Operation on Two Tables,the Tables Do