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Asked: 2026-05-20T05:34:52+00:00

I’m phrasing the question title poorly as I’m not sure what to call what

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I’m phrasing the question title poorly as I’m not sure what to call what I’m trying to do but it really should be simple.

I’ve a link / join table with two ID columns. I want to run a check before saving new rows to the table.

The user can save attributes through a webpage but I need to check that the same combination doesn’t exist before saving it. With one record it’s easy as obviously you just check if that attributeId is already in the table, if it is don’t allow them to save it again.

However, if the user chooses a combination of that attribute and another one then they should be allowed to save it.

Here’s an image of what I mean:

enter image description here

So if a user now tried to save an attribute with ID of 1 it will stop them, but I need it to also stop them if they tried ID’s of 1, 10 so long as both 1 and 10 had the same productAttributeId.

I’m confusing this in my explanation but I’m hoping the image will clarify what I need to do.

This should be simple so I presume I’m missing something.

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1 Answer

  1. Editorial Team

    If I understand the question properly, you want to prevent the combination of AttributeId and ProductAttributeId from being reused. If that’s the case, simply make them a combined primary key, which is by nature UNIQUE.

    If that’s not feasible, create a stored procedure that runs a query against the join for instances of the AttributeId. If the query returns 0 instances, insert the row.

    Here’s some light code to present the idea (may need to be modified to work with your database):

    SELECT COUNT(1) FROM MyJoinTable WHERE AttributeId = @RequestedID
IF @@ROWCOUNT = 0
BEGIN
   INSERT INTO MyJoinTable ...
END
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