What Do You Mean By Not Null? When Will You Use It?

1.	What Do You Mean By Not Null? When Will You Use It?
Answer» The COLUMN cannot have NULLS. USE it for KEY FIELDS. The column cannot have nulls. Use it for key fields.

Answer»

The COLUMN cannot have NULLS. USE it for KEY FIELDS.

The column cannot have nulls. Use it for key fields.

Discussion