Answer / guest

Cause: The select lists to the left and right of a UNION,
INTERSECT, or MINUS expression select at least one column
that is mismatched in datatype. For example, the following
statement is faulty because the constant 3 has datatype
NUMBER, whereas SYSDATE has datatype DATE: CURSOR my_cur IS
SELECT 3 FROM emp INTERSECT SELECT SYSDATE FROM emp;

Action: Change the select lists so that they match in
datatype. You might want to use datatype conversion
functions in the select list of one or more queries.

Please add more information about this Error

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