Database questions

Q.1  In the relational modes, cardinality is termed as:
   (A)  Number of tuples.  (B)   Number of attributes.
 (C)  Number of tables.  (D)  Number of constraints.
 Ans: A

Q.2  Relational calculus is a 
(A)  Procedural language.  (B)  Non- Procedural language.
 (C)  Data definition language. (D)  High level language.
 Ans: B

Q.3  The view of total database content is 
(A)  Conceptual view.  (B)  Internal view.
   (C)  External view.  (D)  Physical View.
 Ans: A




Q.4  Cartesian product in relational algebra is    
   (A)  a Unary operator.  (B)  a Binary operator.
  (C)  a Ternary operator.  (D)  not defined.
 Ans: B  Cartesian product in relational algebra is a binary operator.
  (It requires two operands. e.g., P X Q)

Q.5  DML is provided for 
(A) Description of logical structure of database.
(B) Addition of new structures in the database system.
(C) Manipulation & processing of database.
(D) Definition of physical structure of database system.
 Ans: C  DML is provided for manipulation & processing of database.
 (Data stored in the database is processed or manipulated using data manipulation
language commands as its name)


Q.6  ‘AS’ clause is used in SQL for 
   (A)  Selection operation.  (B)  Rename operation.
   (C)  Join operation.   (D)  Projection operation.
 Ans: B  ‘AS’ clause is used in SQL for rename operation.
  (e.g., SELECT ENO AS EMPLOYEE_NO FROM EMP)

Q.7  ODBC stands for  
 (A)   Object Database Connectivity.
 (B)  Oral Database Connectivity.
 (C)  Oracle Database Connectivity.
 (D)  Open Database Connectivity.
 
 Ans: D
Q.8  Architecture of the database can be viewed as 
   (A)  two levels.                         (B)  four levels.
               (C)  three levels.                       (D)  one level.
 Ans: C



Q.10  In the architecture of a database system external level is the  
(A)  physical level.  (B) logical level.
(C)  conceptual  level  (D) view level.
 Ans: D
Q.11  An entity set that does not have sufficient attributes to form a primary key is a 
(A)  strong entity set.  (B)  weak entity set.
(C)  simple entity set.  (D)  primary entity set.
 Ans: B