If the attribute phone number is included in the relation all the values need not be entered into the phone number column. This type of entry is given as
If the attribute phone number is included in the relation all the values need not be entered into the phone number column. This type of entry is given as Correct Answer Null
Null is used to represent the absence of a value.
মোঃ আরিফুল ইসলাম
Feb 20, 2025