Answer / guest

Cause: A column alias was used in the ORDER BY clause of a
SELECT statement that uses a UNION, INTERSECT, or MINUS set
operator. This is not allowed. In such cases, expressions in
the ORDER BY clause must be unsigned integers that designate
the ordinal positions of select-list items.

Action: Change the alias in the ORDER BY clause to an
unsigned integer that designates the ordinal position of the
select item in question.

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