DELETE a record in SQL table with foreign key

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I have two Tables in my SQL Server.
One is ApplicationUser and the other is UserApprovals.
These two Tables are related with Foreign key from UserApprooval.UserId to ApplicationUser.UserId.
Now I need to DELETE a record; and I start to do it from ApplicationUser, I don't know if that is right because trow an error:

[ The DELETE statement conflicted with the REFERENCE constraint  FK_UserApprovals_ApplicationUser   The conflict occurred in database  ekkerossDB  table  dbo UserApprovals  column UserID 
The statement has been terminated  ]\r\n UpdateApplicationRejectedUser

What I have tried:

I think the right is to DELETE first the UserApprovals and next the ApplicationUser (if that is necessary.
Did some one can assist me on that??

Posted 9-Dec-18 23:39pm

Lefteris Gkinis

Updated 10-Dec-18 0:02am

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2 solutions

Solution 1

If you can't get it working in a normal way, you can use this as a last resort:

-- Disable Constraints at DB level
EXEC sp_MSForEachTable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'
GO
DELETE FROM ApplicationUser
GO
-- Enable Constraints at DB level
EXEC sp_MSForEachTable 'ALTER TABLE ? CHECK CONSTRAINT ALL'
GO

The example shown is for use in SQL Server Management Studio.

Posted 9-Dec-18 23:52pm

RickZeeland

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CHill60 · Accepted Answer · 2018-12-10T00:02:00

Solution 2

Yes, you should delete anything that refers back to the ApplicationUser first i.e. any row that has a foreign key must go before the row with that primary key is removed... if referential integrity[^] is switched on.

You can get SQL to do much of the work for you by using Cascade Delete[^]

And don't forget the MSDN documentation Create Foreign Key Relationships | Microsoft Docs[^]

Posted 10-Dec-18 0:02am

CHill60

Comments

Lefteris Gkinis 10-Dec-18 6:11am

Thank you very much. Your answer was ideal
The DELETE has to start from the Bottom level to Upper Level

CHill60 10-Dec-18 8:27am

Glad to have helped