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The optimizer converts a subquery that follows an IN keyword only if:
The main query does not contain a GROUP BY clause, and is not an aggregate query, or the subquery returns exactly one value.
The subquery does not contain a GROUP BY clause.
The subquery does not contain the keyword DISTINCT.
The subquery is not a UNION query.
The subquery is not an aggregate query.
'expression IN ( subquery-expression )' must not be negated.
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