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ranjita_biswal
New User
Joined: 23 Feb 2005
Posts: 5
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Hi,
Can we delete from a primary table if child tables are there?
Thanks
Ranjita |
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prasadvrk
Active User
Joined: 31 May 2006
Posts: 200
Location: Netherlands
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| It depends on the definition of the table, if restrict on delete is specified you can not but if cascade on delete or set null on delete is specified you can. |
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ranjita_biswal
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Joined: 23 Feb 2005
Posts: 5
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Hi,
Thanks.If nothing is specified on delete table what will happen? |
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prasadvrk
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Joined: 31 May 2006
Posts: 200
Location: Netherlands
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| Default is cascade on delete I suppose |
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murali.gummadi
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Joined: 17 May 2006
Posts: 5
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Hi prasadvrk,
will u please clarify above answer is correct or not.
I think ON DELETE RESRTICT is the defauly.
But you have mentioned ON DELETE CASCADE is default.
Plz clarify this.
Correct me if i am wrong
Thanks & Regards
Murali |
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prasadvrk
Active User
Joined: 31 May 2006
Posts: 200
Location: Netherlands
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Hi Gummadi,
Iwas not sure(as I am not a DBA) that's why I said 'I suppose' . I concentrated on the first part of the question. Thanks for correcting me. |
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vidhyanarayanan
New User
Joined: 23 Dec 2005
Posts: 52
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Hi,
If no Delete Rule definition is provided when the referential constraint is
defined, the ON DELETE NO ACTION definition is used as the default. |
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