This feature will be removed in a future version of Microsoft SQL Server. Avoid using this feature in new development work, and plan to modify applications that currently use this feature.
The ColumnsNullByDefault property controls column default value behavior when a table is created in the Microsoft SQL Server database.
If TRUE, columns in new tables allow NULL.
If FALSE, columns in new tables do not allow NULL.
The default behavior can be changed on a column-by-column basis. For more information, see AllowNulls Property.