Hi,

I'd tried that but when deleting a row in the Rows table I got a 'The DELETE statement conflicted with the REFERENCE restraint' error.
?
Thx,
Viv

>Keep the FK but set ON DELETE NONE
>
>>
>>Thx. Thought that might be the answer ; got it working for cascading the deletes. But that leaves the other half of the equation : How to prevent insertions in the RowColumns table if the ColumnId doesn't exist in the Columns table ?
>>
>>Regards,
>>Viv
>>
>>>You can replace one of ON DELETE CASCADE to RowColumns with a trigger.
>>>