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Self Join Referential Integrity
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To
15/09/2011 10:47:56
General information
Forum:
Microsoft SQL Server
Category:
Database design
Environment versions
SQL Server:
SQL Server 2008
Miscellaneous
Thread ID:
01523616
Message ID:
01523618
Views:
40
>Hi,
>
>I've got a SQL Server Express 2008 R2 database which has a Person table where I store People and their dependents like this:
>
>PersonId
>Name
>ParentId
>
>So one PersonID can have many dependents by storing their ID in the ParentID field (simple self join).
>
>I want to set up referential Integrity on this table so that if a parent is deleted, their dependents are deleted (cascade). I created a database diagram, dropped my Person table on it and then dragged the PersonId field to the ParentID field. However, when I try to set the Delete Rule to Cascade, it is disabled.
>
>How can I do this?\

I don't believe such complex RI is supported. Most likely you need to implement this RI through the trigger.
If it's not broken, fix it until it is.


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