Web Reference: 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. INSERT fails. The statement has been terminated. The solution: I created the column I needed id_foreign, allowing nulls. I edited/inserted all the required values for id_foreign. Once the values where in place, I went back and unchecked the "Allow Nulls" checkbox. Now the error was gone. Oct 9, 2025 · I'm running a SQL Server test script that inserts employee data and performs several operations. Some statements work, but a few lines throw different errors — duplicate keys, missing columns, and invalid joins. Below is my script. Can anyone explain which parts cause these specific SQL errors and why they occur?
YouTube Excerpt: https://codedocu.com/Details?d=2139&a=10&f=352&l=0 System.Data.SqlClient.SqlException occurred HResult=0x80131904 ...
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