If a particular column is not allowed to be null, anytime you add a row of data to the table, the DBMS will require a value for the column.

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When a column is designated as not null, it means that every row in the table must have a value for that column. Therefore, when inserting a new row, the database management system will enforce this rule and require a value to be provided for the non-null column.

If a Particular Column Is Not Allowed to Be Null