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Editorial Team
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Asked: 2026-06-03T02:44:11+00:00

I have a Table Task with TaskId as Primary Key. And another table TimeSheet

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I have a Table Task with TaskId as Primary Key. And another table TimeSheet with TaskId as foreign key. I created foreign key relation like this 

ALTER TABLE TimeSheet ADD CONSTRAINT fk_TimeSheet_TaskId FOREIGN KEY(TaskId)
REFERENCES Task (TaskId)
GO

Actually, if I try to delete (or update) a row in Task table it should show an error regarding foreign key relation. And if I try to delete in TimeSheet table I should not get any error.

But for me I am getting the 547 error if I try to delete or update in TimeSheet table.
Nulls are allowed in Foreign Key column (TaskId in TimeSheet Table).

What should I do here? I want to throw error if I try to delete or Update in parent table (Task) and No error if I try to delete or update in child table (TimeSheet).

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1 Answer

  1. Editorial Team

    If we use FOREIGN KEY:

    Whenever rows in the master (referenced) table are deleted (resp. updated), the respective rows of the child (referencing) table with a matching foreign key column will get deleted (resp. updated) as well. Not vice-verse.

    If you want to work as per your question try to use trigger.

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