If you specify NOT NULL for a column when you create a table,you are prohibited from changing a value in the column to null.

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When a column is created as NOT NULL, it means the column must have a value in every row, and if an attempt is made to insert a null value or update an existing value to null, it will result in a constraint violation error. Therefore, you cannot change a value in the column to null.

If You Specify NOT NULL for a Column When You