Why am I Getting the SQL Server Error 'Cannot Insert the Value NULL into Column 'id''?

Solving the SQL Server Error: "Cannot insert the value NULL into column 'id'"

This common SQL Server error, "Cannot insert the value NULL into column 'id'...", arises when attempting to insert a record into a table without providing a value for a non-nullable column, typically the primary key ('id'). This happens when the column lacks a default value and no value is explicitly supplied during the insertion.

Here's how to fix it:

• Check Column Definition: Double-check the 'id' column's definition in your table schema. Confirm it's a non-nullable data type and that a default value isn't already assigned.

• Enable Auto-Increment: If 'id' is meant to be an auto-incrementing primary key, ensure this feature is enabled. In SQL Server Management Studio (SSMS), open the table in Design mode, select the 'id' column, and set the "Identity Specification" property to "Yes." This will automatically generate unique IDs for new rows.

• Manual Value Assignment: If auto-increment isn't desired or feasible, you must manually supply a unique value for 'id' in your INSERT statement. Alternatively, use a sequence or identity function to generate the value before the insertion.

By following these steps, you can prevent the "Cannot insert the value NULL into column 'id'" error and successfully add rows to your table.

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