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Delete parent record


Delete parent record

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ShekharNaidu
ShekharNaidu
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Hi all
In a recent interview I had in some organization, i got this question.

How delete a parent table record without deleting child table record.

can you please any one tell me how to do it.


Thanx in advance.


Thanks ,

Shekhar

Lowell
Lowell
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you can't without breaking referential integrity.

Otherwise you'd be dropping the foreign key constraint, or disabling the foreign key constraint so it would be invalid after you deleted the parent record.

maybe they were trying to get you to say you'd have to set the child FK to NULL before you delete the parent?

Lowell

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ShekharNaidu
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they said we have way of doing it..without disabling/deleting the FK..

I asked for the answer...but he said..."it is good if you find out urself"..Crying


Thanks ,

Shekhar

Steve Jones
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You'd have to move the child, disable the FK, or drop the FK. My guess is they are moving the child to another record, or a holder record.

Or they don't have FKs defined and are enforcing them in the app only.

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Paul White
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Cascading DELETE with an action of SET NULL or SET DEFAULT



Paul White
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ZenDada
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Paul White NZ (5/27/2010)
Cascading DELETE with an action of SET NULL or SET DEFAULT


Right answer. 10 points.

ZenDada
Paul White
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ZenDada (5/27/2010)
Right answer. 10 points.

Steve!!! Ten points please!



Paul White
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ShekharNaidu
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hey paul..
if you dont mind...can you please elobarate...


Thanks ,

Shekhar

Steve Jones
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Did not know that, though I've avoided cascading deletes and updates for years.

Does anyone use this?

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Paul White
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ShekharNaidu (5/27/2010)
hey paul..
if you dont mind...can you please elobarate...

Sure, there's a whole section of Books Online about it:
http://technet.microsoft.com/en-us/library/ms186973.aspx



Paul White
SQLPerformance.com
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