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NULLIF-Beispiel
select avg( nullif(Weight, -1) ) from FatPeopleDadurch wird das durchschnittliche Gewicht der in FatPeople aufgelisteten Personen zurückgegeben, mit Ausnahme derer mit einem Gewicht von -1, da "AVG" "NULL"-Daten überspringt.Vermutlich bedeutet -1 in dieser Tabelle “Gewicht unbekannt”.Ein einfaches AVG(Weight) würde die -1 Gewichte enthalten, wodurch das Ergebnis verzerrt wird.