DBI202Xuất hiện trong 3 đề thi
In the relational DBMS, what is the difference between PRIMARY KEY and UNIQUE KEY?
Các lựa chọn
AUNIQUE KEY dosen't accept the NULL value but PRIMARY KEY does
BUNIQUE KEY and PRIMARY KEY are the same
CA table can have more than one PRIMARY KEY constraint but only one UNIQUE KEY
DA table can have more than one UNIQUE KEY constraint but only one PRIMARY KEY