Web Reference: I had a similar problem and upon looking into it, it was simply a field in the actual table missing id (id was empty/null) - meaning when you try to make the id field the primary key it will result in error because the table contains a row with null value for the primary key. Jul 23, 2025 · In this article, we will explain the root causes of this error, provide step-by-step solutions to resolve it, and share essential best practices for working with identity columns effectively. Sep 28, 2024 · To fix this issue, insert a non-NULL value. Here’s an example of code that produces the error: Output: Cannot insert the value NULL into column 'CatId', table 'demo.dbo.Cats'; column does not allow nulls. INSERT fails.
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