FK constraint question

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От Heinemann, Manfred (IMS)
Тема FK constraint question
Дата
Msg-id e5f1fa241b2a4f67816c3f1915f49ff2@NAIAD.omni.imsweb.com
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Ответы Re: FK constraint question
Re: FK constraint question
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Can something explain why something like the following could happen?

 

INSERT INTO task_history (task_id, user_id, task_date)

SELECT task_id, user_id, task_date

FROM task

WHERE task_id IN (1, 2, 3);

 

ERROR: insert or update on table "task_history" violates foreign key constraint "fk_task_history_task_id"

  Detail: Key (task_id)=(1) is not present in table "task".

 

Thanks,

Manfred




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