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unknown
sql
2 years ago
155 B
1
Indexable
Never
SELECT f1.X, f1.Y FROM Functions f1
INNER JOIN Functions f2 ON f1.X=f2.Y AND f1.Y=f2.X
GROUP BY f1.X, f1.Y
HAVING COUNT(f1.X)>1 or f1.X<f1.Y
ORDER BY f1.X