Web Reference: Sep 28, 2024 · We can’t insert NULL values into non-nullable columns. 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. If you do not mention any field in the fields list for insert it'll be supposed to be null or default value. Set identity (i.e. autoincrement) for this field if you do not want to set it manualy every time. Mar 2, 2026 · Fix "Cannot insert NULL into column 'Srno'" in SQL Server when Srno should auto-increment. Learn a production-safe solution involving temporary tables and foreign keys.
YouTube Excerpt: Encountering "Msg 515, Level 16" in SQL Server? This error occurs when you try to
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