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public sql v1 · immutableSELECT DISTINCT *FROM foobar f1WHERE NOTEXISTS (SELECT *FROM foobar f2WHERE f1.a = f2.bAND f1.b = f2.aAND f2.a < f2.b)SELECT DISTINCT *FROM foobar f1WHERE NOTEXISTS (SELECT *FROM foobar f2WHERE f1.a = f2.bAND f1.b = f2.aAND f2.a < f2.b)