Hi,

Considered that too. But, as I understand it, the Insert has already occurred when the trigger fires so I'm not sure what best to put in the trigger.....

Regards,
Viv

>I guess you'll have to write another trigger for the RowColumns table to validate ColumnId against the Columns table
>
>>
>>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.
>>>>>