Why is SQL server throwing this error: Cannot insert the value NULL into column ‘id’?

I’m assuming that id is supposed to be an incrementing value.

You need to set this, or else if you have a non-nullable column, with no default value, if you provide no value it will error.

To set up auto-increment in SQL Server Management Studio:

  • Open your table in Design
  • Select your column and go to Column Properties
  • Under Indentity Specification, set (Is Identity)=Yes and Indentity Increment=1

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