Inserting NULL when foreign key gets deleted.

I have a couple of tables in my database (SQL server 2000)
1. Student -- Columns are as
"StudentID" -- INT
"StudentName" -- NVARCHAR
"DepartmentID" -- INT
2. Department -- Columns are as
"DepartmentID" -- INT
"DepartmentName" -- NVARCHAR
So in the table "Student", the field "DepartmentID" is a foreign key. Now
what I need to do is that when I delete a row in the "Department" table, the
n
the rows in "Student" table where the to be deleted "Department ID" occurs
must *not* get deleted. Instead NULL should be inserted there.
Can this be achieved through database schema? Or is it something that needs
to be done through triggers?
A.
Locate me in the blogosphere: http://spaces.msn.com/aayushpuriIn 2005, you can define SET DEFAULT and SET NULL for a foreign key reference
(and of course CASCADE
and restrict). In 200, you need to write code for this(trigger, for example)
.
Tibor Karaszi, SQL Server MVP
http://www.karaszi.com/sqlserver/default.asp
http://www.solidqualitylearning.com/
"Aayush Puri" <aayushpuri @. h o t m a i l . c o m> wrote in message
news:0F995DF3-EFED-475B-9F22-E96302A58F0B@.microsoft.com...
>I have a couple of tables in my database (SQL server 2000)
> 1. Student -- Columns are as
> "StudentID" -- INT
> "StudentName" -- NVARCHAR
> "DepartmentID" -- INT
> 2. Department -- Columns are as
> "DepartmentID" -- INT
> "DepartmentName" -- NVARCHAR
> So in the table "Student", the field "DepartmentID" is a foreign key. Now
> what I need to do is that when I delete a row in the "Department" table, t
hen
> the rows in "Student" table where the to be deleted "Department ID" occurs
> must *not* get deleted. Instead NULL should be inserted there.
> Can this be achieved through database schema? Or is it something that need
s
> to be done through triggers?
> A.
> --
> Locate me in the blogosphere: http://spaces.msn.com/aayushpuri|||Thanks a lot Tibor for the quick reply. In the meanwhile I also searched a
bit more for the solution to my problem. I got to this article on MSDN -
http://msdn.microsoft.com/library/d...fintegrity.asp.
It explains as to how to implement the "ON DELETE INSERT NULL" functionality
as TRIGGER in SQL server 2000.
A.
Locate me in the blogosphere: http://spaces.msn.com/aayushpuri
"Tibor Karaszi" wrote:

> In 2005, you can define SET DEFAULT and SET NULL for a foreign key referen
ce (and of course CASCADE
> and restrict). In 200, you need to write code for this(trigger, for exampl
e).
> --
> Tibor Karaszi, SQL Server MVP
> http://www.karaszi.com/sqlserver/default.asp
> http://www.solidqualitylearning.com/
>
> "Aayush Puri" <aayushpuri @. h o t m a i l . c o m> wrote in message
> news:0F995DF3-EFED-475B-9F22-E96302A58F0B@.microsoft.com...
>
>