Answer / guest

Cause: The SELECT clauses to the left and right of a UNION,
INTERSECT, or MINUS expression do not select the same number
of columns. For example, the following statement is faulty
because the select lists do not contain the same number of
items: CURSOR my_cur IS SELECT ename FROM emp INTERSECT
SELECT ename, empno FROM emp;

Action: Change the select lists so that they contain the
same number of items.

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