This set of Database Management System (DBMS) MCQ questions on database Normalization, Data Definition Language (DDL), Data Manipulation Language (DML) and Data Control Language (DCL). We believe these will help you for any IT competitive exams, also can enrich IT skills.
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1. The candidate key is that you choose to identify each row uniquely is called ……………..
Ans: Primary Key
- …………….. is used to determine whether of a table contains duplicate rows.
Ans: Unique predicate
- To eliminate duplicate rows ……………… is used
Ans: DISTINCT
- State true or false
i) A candidate key is a minimal super key.
ii) A candidate key can also refer to as surrogate key.
Ans: i-true, ii-true
- DCL stands for
Ans: Data Control Language
- …………………… is the process of organizing data into related tables.
Ans: Normalization
- A ………………. Does not have a distinguishing attribute if its own and mostly are dependent entities, which are part of some another entity.
Ans: Weak entity
- …………….. is the complex search criteria in the where clause.
Ans: Predicate
- ………………… is preferred method for enforcing data integrity
Ans: Constraints
- The number of tuples in a relation is called its …………. While the number of attributes in a relation is called it’s ………………..
Ans: Cardinality, Degree
11) The language that requires a user to specify the data to be retrieved without specifying exactly how to get it is
Ans: Non-Procedural DML
12) Which two files are used during operation of the DBMS?
Ans: Data dictionary and transaction log
13) The database schema is written in
Ans: DDL
14) The way a particular application views the data from the database that the application uses is a
Ans: sub schema
15) The relational model feature is that there
Ans: is much more data independence than some other database models
16) Which one of the following statements is false? (Ans – B)
A) The data dictionary is normally maintained by the database administrator
B) Data elements in the database can be modified by changing the data dictionary.
C) The data dictionary contains the name and description of each data element.
D) The data dictionary is a tool used exclusively by the database administrator.
17) Which of the following are the properties of entities?
Ans: Attributes
18) Which database level is closest to the users?
Ans: External
19) Which are the two ways in which entities can participate in a relationship?
Ans: Total and partial
20) …….. data type can store unstructured data
Ans: RAW