Questions and Answers for Database Interviews to Aid Your Preparation: There are typical interview questions for anyone seeking a position in database management. It could enhance your interview performance if you were familiar with these questions and practiced replies. We define database interview questions, list 50 questions you might be asked at your next database-related job interview, and provide sample answers to all of these questions so you can be fully prepared.
Do you know any good database interview questions?
Interviewers will use open-ended questions about databases to gauge your level of knowledge and experience in the field. The interviewer will evaluate whether or not your database expertise meets the company’s requirements based on the information you provide during the interview. Interviewees in the IT and CS industries can expect to be asked questions like these. Jobs in the field of database management include:
Data modeler
Database administrator
Information security analyst
Computer and information systems manager
Market research analyst
Database Engineer
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Information about databases in general
Before diving into more specific questions, the interviewer will likely test your knowledge of databases by asking you broad, introductory questions. Some common inquiries include the following:
What is a database?
What is SQL?
What is a SELECT statement?
What is data redundancy?
What are B-trees?
What is a materialized view?
What is database partitioning?
What is Index hunting?
What is an object-oriented database model?
What is a hashing technique in a database?
What does data independence mean?
What is data warehousing?
As part of gauging whether or not your skillset matches the needs of the company, most interviewers will focus on your level of database proficiency. These are some examples of questions that may be asked to learn more about your qualifications and history:
Have you worked with Hadoop or Hive before?
Describe your experience working with databases.
What was your most challenging work project?
How do you choose to stay up-to-date with new database technologies?
Name a time when you implemented a solution that improved data storage. What was the solution?
Would you run a test on a live database? Why or why not?
Share a method you have used to test, correct, and modify databases. Was this method effective?
Describe a time when you worked on a team to coordinate database development. How did your participation benefit the development of the project and the company?
Deep probing
Questions that require a high level of technical expertise and an in-depth understanding of database management, analysis, or development are classified as “in-depth.” Some of the more in-depth interview questions are as follows:
What are the advantages and disadvantages of views in a database?
What are the types of relationships in a database?
What are the types of normalization?
What are the properties of a transaction?
List some advantages of DBMS
What are the standard SQL commands every SQL developer should know?
Can you explain how an RDBMS organizes data into tables and fields?
What are triggers? How do you invoke a trigger on demand?
How can you identify if a database server is running properly?
When does functional dependency become fully functional dependency?
How do you find the total number of records in a table?
Name four ways to maintain data integrity within an RDBMS.
Define what a DML Compiler is.
What’s the most effective way to store and access files in a database?
Explain Entity, Entity type, and Entity set.
What is denormalization?
Explain the importance of database partitioning.
What happens when Shared and Exclusive locks are applied to a data item?
Provide examples of these commands: DDL, DML, and DCL.
What are the differences between nested loop, hash join, and merge join?
What are some disadvantages of file processing systems?
What is data abstraction? Provide an example.
How many levels of data abstraction are there? And what do they do?
What are the integrity rules in DBMS?
Explain ACID properties.
How do you test database procedures and triggers?
What is the UNION operator’s use?
What are the risks of storing a hibernate-managed object in a cache? How do you overcome problems if there any?
How do view and data independence relate to one another?
How do you improve query performance by using Index hunting?
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Questions and answers from a sample database interview
These interview questions and answers might help you get ready for your upcoming interview. Take notes during the preparation process so that you may go over them again before the interview.
To begin, let’s define a database.
To store, retrieve, and manipulate large amounts of data in a timely manner and with minimal effort, one could, for instance, use a database.
The meaning of SQL is explained.
As one such explanation goes, “Structured Query Language is a computer language developed for managing data in relational database management systems.”
A table’s entire number of records can’t be accessed without first knowing how to access the table itself.
Here’s a sample reply: “The COUNT statement can be used to get the total number of records in a table. The expression “select COUNT from products” would be used as an example.
How well-versed should a SQL developer be in the most fundamental SQL commands?
One possible response reads, “There are three fundamental SQL commands. DCL, DDL, and DML all stand for “Data Control Language,” “Data Definition Language,” and “Data Manipulation Language,” respectively. And the four most important things you can do with a database are created, read, update, and delete.
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Do you intend to test on the production database? So, why not?
An example response could be, “I would not run a test on a live database since it can substantially modify a database if the correct SELECT query and WHERE clause is not used and it is an overall bad concept to test on live databases.”
When are we triggered, exactly? Is there a way to force a trigger to fire?
When an INSERT, UPDATE or DELETE operation is performed on a table, triggers (a subset of stored procedures) are automatically invoked. The use of triggers is not selective. They are not triggered unless one of the defined table’s columns undergoes an associated operation (INSERT, UPDATE, DELETE).
Explain the SELECT statement to me.
For instance, here’s a possible response: “The SELECT query gets information out of a database. When complete, the data is sent back to the original result set. Among database operations, the SELECT statement is by far the most common.
Can you describe the tables and fields used by an RDBMS to store information?
Data in a relational database is often organized using tables” (or relations). Columns and rows make up a table’s structure. You can also refer to a column as a field or an attribute. A database table can be compared to an Excel spreadsheet. Because of the connections that can be made between tables, a relational database can easily store and retrieve vast amounts of data. A customer record may, for instance, have the following fields: ID, name, address, and purchase.
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Please enumerate some benefits of database management systems.
As an answer example, consider the following:
“The advantages of DBMS are:
Controlling redundancy
Giving backup a D recovery
Restricting unauthorized access
Getting integrity constraints enforced
Providing multiple user interfaces.”
How many distinct normalizing procedures exist?
An answer example could be, “First, second, and third normal forms are the most frequent normalization methods. You can shorten their names to “1NF,” “2NF,” and “3NF.”
Just what is the function of the UNION operator?
You can join the results of many SELECT statements using the UNION operator, as demonstrated by the following example answer.
In a relational database management system, what are the four methods for ensuring data integrity?
To illustrate, consider the following: “There are four forms of data integrity that are relevant when storing and keeping data within an RDBMS. These items are:
Entity (Row) integrity, which avoids duplicate rows in tables
Domain (Column) integrity, which restricts the type, format, or range of values for valid entries
User-defined integrity, which enforces rules set by the user that exist separately from other categories
Referential integrity, which makes sure rows used by other records cannot be deleted”
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