Advance DBMS MCQ Question with Answer

Question No : 8
The ________ states that a foreign key must either match a primary key value in another relation or it must be null.

Question No : 9
Three SQL, DDL, CREATE commands are

Question No : 10
In the architecture of a database system external level is the

Question No : 11
An entity set that does not have sufficient attributes to form a primary key is a

Question No : 12
In a Hierarchical model records are organized as

Question No : 13
In an E-R diagram attributes are represented by

Question No : 14
In case of entity integrity, the primary key may be