Database Interview Questions-Know More

As a computer student, you must be aware of the fact that data is very important. Data form the lifeline of any organization. It is very important to save relevant data in a secure place in such a way that it can retrieve easily whenever required. Thus, most organizations hire specialists to manage their databases. These specialists are known as Database Administrators. Let us know about that the Database Interview Questions.

Database Interview Questions

Job prospects in the field of data administration are very high. It is a very lucrative job position. If you are searching for a job in the technology field, it could be a great area to explore. We are compiling a set of important questions that you can prepare before appearing for an interview. One should always understand that confidence is the key to success. Thus prepare these questions and face the interview with confidence. You will certainly get success and you will be able to secure a well-paid, satisfying job.

To help you, we have divided the important questions into various categories

Basic Questions

This category includes theoretical questions that are asked to check the basic understanding of the subject. Various definitions and facts questions are comprised in this section.

  • What is a database? Give a few examples?
  • How can you distinguish between a database and a database management system?
  • Give at least three instances of Database Management systems.
  • Explain RDBMS and give an example of it.
  • Who is a database administrator?
  • Can you explain the duties of a database administrator?
  • How can databases be classified?
  • Why managing a database is important?
  • Can you explain the transaction with the help of a diagram?
  • What is the meaning of Views in DBMS?
  • Why does it important to provide different views to different users?

The solution to the above questions can be seen in any database book or online platform. However, we are providing keys to few questions for your consideration.

Can you explain the duties of a database administrator?

A: All the maintenance, security concern and ensuring availability of data is within the job profile of database administrator.

Give at least three instances of Database Management systems.

 A: SQL, MySQL and Oracle.

Simple Conceptual Questions

In this category, questions are asked to check the conceptual knowledge of an applicant. You should answer this variety of questions in great detail.

  • What are checkpoints? Why do we need them?
  • Can you explain the meaning of attribute? How are they represented in an ER Diagram?
  • Can you tell me about transparent DBMS?
  • Why is it important to make ER Diagram in database designing?
  • Can you draw all the symbols used while making an ER Diagram?
  • Can you create an ER Diagram using a software tool?
  • How can you differentiate between relational algebra and relational calculus?
  • What is the need for relational algebra?
  • How functional dependencies are important?
  • Differentiate between functional dependencies and multivalued dependencies.
  • Can you explain inclusion dependency with an appropriate example?
  • Why a transaction is atomic? 
  • What will happen if a transaction is not atomic?

Here, we are also providing keys to few questions for your consideration.

 Why a transaction is atomic? 

A: Transactions are atomic to ascertain that the database is always in consistent state.

What will happen if a transaction is not atomic?

A: If a transaction is not atomic then there is a possibility that database become inconsistent, which invalidate its importance.

Questions based on Query Language

The interviewer asks a lot of questions about query language to check whether a candidate is accustomed to the concept of query writing.

  • Can you tell me about the data definition language? How is it distinct from data manipulation language?
  • Is there any distinction between a zero and a not null value?
  • Give a few examples of queries written in DDL.
  • Give a few examples of queries written in DML.
  • Is an INSERT query a DML?
  • Why is it important to have a Primary key in a table?
  • What is the importance of foreign key? Can you give an example?
  • Can we have more than one primary key in a table?
  • Differentiate between relation and relationship in DBMS.

These questions are asked to understand the familiarity of a candidate with a query language.

Questions based on Query Execution

In this category, the practical knowledge of a candidate regarding SQL query formation is determined. An aspirant needs to be highly trained in these questions.

  • Can you create a table of your choice having a primary key, a check constraint, a default value, and a not-null attribute?
  • Join any two tables of the Library Management System.
  • Add a primary key to an existing table.
  • Can you find the names of all clients starting with “a”?
  • Questions based on Advanced concept of SQL

In this category, questions related to advanced concepts are asked. Here the higher-level skill of the aspirant is measured.

  • Why do we normalize relations?
  • Can you differentiate between 3NF and BCNF?
  • Why are triggers used? 
  • Can you write the syntax of the trigger?
  • Explain the concept of Views with an example.
  • How does index hunting help in increasing the efficiency of a database?
  • Can you name two clauses used in SQL? Write the syntax of both.

Conclusion

If you are interested in making a carrier in the database, you need to be well versed with basic and advanced concepts of database. These queries will help you to qualify for various interviews in the field. You can find the solutions to these queries in any book of DBMS. You can also make references to any educational website for the same. 

Prepare these questions and also revise various concepts of a database for a great interview. You can raise your doubts in the comment section. We hope that you will achieve your goal in the next upcoming interview. 

Frequently Asked Questions

Q: Can you suggest a book for revising concepts of DBMS?

A: You can refer to any database book for understanding and revising database concepts. For reference, you can check “Database Systems: Design, Implementation, and Management” by the author Carlos M Coronel.

Q: How can I look confident in an interview?

A: It is very important to feel confident during an interview. If you are prepared well, you will have the confidence to deal with the interviewer. If you don’t know the answer to a question, you can politely tell the interviewer and request for next question.

Q: What are the job prospects in the field of the database?

A: There are plenty of opportunities available in the field of the database. An aspirant can apply for the position of database designer or database administrator. You can also look for the position of database developer and database programmer. 

Database Interview Questions-Know More

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