Kizspy | Question: 9
(Choose 1 answer)
In the relational DBMS, what is the difference between PRIMARY KEY and UNIQUE KEY?
A. UNIQUE KEY dosen't accept the NULL value but PRIMARY KEY does
B. UNIQUE KEY and PRIMARY KEY are the same
C. A table can have more than one PRIMARY KEY constraint but only one UNIQUE KEY
D. A table can have more than one UNIQUE KEY constraint but only one PRIMARY KEY
