சிவகுமார் மா wrote:
>> You want to have a "conditional" foreign key reference that checks
>> against different tables depending on a "type" field, right?
>>
>> For complicated conditions like this, you could use a
>> BEFORE INSERT trigger that throws an error when the condition
>> is violated.
>
> That we do. My query is to put a check on select queries to avoid
> programmers not using all the necessary conditions.
You can create a view that does the join the correct way
(maybe a UNION of two different joins) and give the programmers
access to that view, but not to the underlying tables.
Yours,
Laurenz Albe