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
A. 0
B. –
C. Null
D. Empty space
Answer:C
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
A. 0 B. – C. Null D. Empty space