... 5, så ville jeg gerne have alle de emne række som er tilknyttet til ref 1 og 2, da ref 1 og 2 indholder 5. Så resultat bliver 2,4,5 Forespørgslen kan udtrykkes vha. en sub-query- eller en self-join- konstruktion. Personligt finder jeg sub-query konstruktionen mest læsbar. Ud fra en performance-mæssig betydning burde det være lige meget hvilken du vælger, idet dit DBMS' optimizer ...

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