ALTER TABLE d_events ADD CONSTRAINT d_events_client_num_fk FOREIGN KEY (client...
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ALTER TABLE d_eventsADD CONSTRAINT d_events_client_num_fk FOREIGN KEY (client_number) REFERENCES d_clients(client_number) ON DELETE CASCADE
A fenti parancs a client_number-t idegen kulcsnak jelöli, kvázi összekapcsolja a táblát egy másik (d_clients) táblával, ahol a kapcsoló mező a client_number.
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