Ich muss Zeilen löschen guide_category, die keine Beziehung zur guideTabelle haben (tote Beziehungen). Folgendes möchte ich tun, aber es funktioniert natürlich nicht. DELETE FROM guide_category AS pgc WHERE pgc.id_guide_category IN (SELECT id_guide_category FROM guide_category AS gc LEFT JOIN guide AS g ON g.id_guide = gc.id_guide WHERE g.title IS NULL) Error: …
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