25 DBMS questions for job interview

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Here we come with DBMS questions for job interview which help you to prepare for the interview.

Overview of DBMS

A Database is a collection of related data organized in such a way that all data can be easily accessed, managed, and updated.

DBMS helps to reduce the anomalies found in a table.

DBMS is software that allows the creation, definition, and manipulation of a database. DBMS is actually a tool used to perform any kind of operation on data in the database. Example: MySQL, Oracle, Sybase, etc.


  • There are mainly 4 types of DATABASE MODEL
    • Hierarchical Model.
    • Network Model.
    • Entity-Relationship Model.
    • Relational Model.
  • ENTITY:- An Entity is generally a real-world object which has it’s own characteristics and holds the relationships in a DBMS.
  • ATTRIBUTE:- Attributes describe the characteristics or properties of an entity in a database table. An entity may contain more than one attribute.
  1. In DBMS there are basically three types of relationships-
    • One to One relation.
    • One to Many relations.
    • Many to Many relations.


is an attribute or set of attributes that help you to identify a row(TUPLE) in a relation(table). They allow you to find the relation between two tables. Keys help you uniquely identify a row in a table by a combination of one or more columns in that table.


  1. There are mainly 7 different types of keys-
    • Primary Key.
    • Super Key.
    • Candidate Key.
    • Alternate Key.
    • Foreign Key.
    • Compound Key.
    • Composite Key.
    • Surrogate Key.

Database Normalization is a technique of organizing the data in the database. Normalization is a systematic approach of decomposing tables to eliminate data redundancy(repetition) and undesirable characteristics like Insertion, Update, and Deletion Anomalies.

There are few normalization forms such as-

    • 1NF
    • 2NF
    • 3NF
    • BCNF
    • 4NF
  1. Structure Query Language(SQL) is a database query language used for storing and managing data in Relational DBMS.

DBMS questions for job interview help to grow  your knowledge, go and practice it

DBMS quiz question:-



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#1. _____ express the number of entities to which another entity can be associated via a relationship set.

#2. An entity in A is associated with at most one entity in B. An entity in B, however, can be associated with any number (zero or more) of entities in A.

#3. Data integrity constraints are used to:

#4. _____ is a special type of integrity constraint that relates two relations & maintains consistency across the relations.

#5. Drop Table cannot be used to drop a table referenced by a ___ constraint.

#6. We indicate roles in E-R diagrams by labeling the lines that connect ____ to _____

#7. For a weak entity set to be meaningful, it must be associated with another entity set, called the

#8. Weak entity set is represented as

#9. What term is used to refer to a specific record in your music database; for instance; information stored about a specific album?

#10. SELECT * FROM teaches WHERE Sec_id = 'CS-101'; Which of the following Id is selected for the following query?

#11. The relation changes can be got back using ____ command

#12. The total participation by entities is represented in E-R diagram as

#13. In E-R diagram generalization is represented by

#14. A primary key is combined with a foreign key creates

#15. The entity set person is classified as student and employee. This process is called

#16. If an entity set is a lower-level entity set in more than one ISA relationship, then the entity set has

#17. A _____ constraint requires that an entity belong to no more than one lower-level entity set.

#18. Which of the following is another name for a weak entity?

#19. In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect?

#20. E-R modelling technique is a:

#21. The number of entities to which another entity can be associated via a relationship set is expressed as:

#22. Every weak entity set can be converted to a strong entity set by:

#23. Relations produced from an E-R model will always be in :

#24. Drop Table cannot be used to drop a table referenced by a ___ constraint.

#25. The entity relationship set is represent by in E-R diagram as



in conclusion, I just wanted to say one thing nothing comes without hard work, just slowly dive into it, a gateway will automatically open for you, just give your 100%after that see you will able to crack it.

similarly,  in any instance, you will be happy, after that when the time has gone you will realize, therefore i have wanted so many times of my life.

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