DBMS Interview Questions 2022 | MySQL Interview Questions 2022 | DBMS Most Asked Interview Questions

by
DBMS Interview Questions 2022 | MySQL Interview Questions 2022 | DBMS Most Asked Interview Questions

Ques: What is a database?

Ans: A information may be a logically coherent assortment of information with some inherent that means, representing some facet of the globe and that is meant, designed, and inhabited with information for a selected purpose.

Ques: What is DBMS?

Ans: It is a set of programs that permits users to form and maintain info. In alternative words it’s general computer code that has the users with the processes of shaping, constructing, and manipulating the info for numerous applications.

Ques: What is a Database system?

Ans: The database and DBMS software together is called a Database system.

Ques: What are the advantages of DBMS?

Ans:

  1. Redundancy is
  2. Unauthorized access is
  3. Providing multiple user
  4. Enforcing integrity
  5. Providing backup and

Ques: What are the disadvantages of a File Processing System?

Ans:

  • Data redundancy and
  • Difficult in accessing
  • Data  Data integrity.
  • Concurrent access is not
  • Security

Ques: Describe the three levels of data abstraction?

Ans: There are three levels of abstraction:

  1. Physical level: The lowest level of abstraction describes how data are
  2. Logical level: The next higher level of abstraction, describes what data are stored in database and what relationship among those data.
  3. View level: The highest level of abstraction describes only part of entire

Ques: Define the “integrity rules”?

Ans: There are two Integrity rules.

  1. Entity Integrity: States that “Primary key cannot have NULL value”
  2. Referential Integrity: States that “Foreign Key can be either a NULL value or should be Primary Key value of other relation.

Ques: What are extension and intention?

Ans:

  1. Extension: It is the number of tuples present in a table at any This is time dependent.
  2. Intension: It is a constant value that gives the name, structure of table and the constraints laid on

Ques: What is System R? What are its two major subsystems?

Ans: System R was designed and developed over the period of 1974-79 at IBM San Jose Research Center. It is a prototype and its purpose was to demonstrate that it is possible to build a Relational System that can be used in a real-life environment to solve real-life problems, with a performance at least comparable to that of the existing system.

Its two subsystems are:

  • Research Storage
  • System Relational Data

Ques: How is the data structure of System R different from the relational structure?

Ans: Unlike Relational systems in System R:

  1. Domains are not supported
  2. Enforcement of candidate key uniqueness is optional
  3. Enforcement of entity integrity is optional
  4. Referential integrity is not enforced

Ques: What is Join?

Ans: An SQL Join is used to combine data from two or more tables, based on a common field between them. For example, consider the following two tables.

Student Table

ENROLLNOSTUDENTNAMEADDRESS
1000geek1geeksquiz1
1001geek2geeksquiz2
1002geek3geeksquiz3

Student Course Table

COURSEIDENROLLNO
11000
21000
31000
11002
21003

Following is a join query that shows the names of students enrolled in different courseIDs.

SELECT StudentCourse.CourseID, Student.StudentName FROM StudentCourse INNER JOIN Customers ON StudentCourse.EnrollNo = Student.EnrollNo ORDER BY StudentCourse.CourseID;

The above query would produce the following result.

COURSEIDSTUDENTNAME
1geek1
1geek2
2geek1
2geek3
3geek1

Ques: What is a view in SQL? How to create one

Ans: A view is a virtual table based on the result-set of an SQL statement. We can create using create view syntax.

CREATE VIEW view_name AS SELECT column_name(s) FROM table_name WHERE condition;

Ques. There is a table where only one row is fully repeated. Write a Query to find the repeated row

NameSection
abcCS1
bcdCS2
abcCS1

In the above table, we can find duplicate rows using the below query.

SELECT name, section FROM tbl GROUP BY name, section HAVING COUNT(*) > 1

Ques. What is the Query to find the 2nd highest salary of an employee?

Ans:

SELECT max(salary) FROM EMPLOYEES WHERE salary IN (SELECT salary FROM EMPLOYEEs MINUS SELECT max(salary) FROM EMPLOYEES);

OR

SELECT max(salary) FROM EMPLOYEES WHERE salary <> (SELECT max(salary) FROM EMPLOYEES);

Ques. Get employee details from employee table whose first name ends with ‘n’ and name contains 4 letters

Select * from EMPLOYEE where FIRST_NAME like '___n'; #(Underscores)

Ques. Get employee details from employee table whose first name starts with ‘J’ and name contains 4 letters

Select * from EMPLOYEE where FIRST_NAME like 'J___'; #(Underscores)

Ques. Get employee details from employee table whose Salary greater than 600000

Select * from EMPLOYEE where Salary >600000;

Ques. Get employee details from employee table whose Salary less than 800000

Select * from EMPLOYEE where Salary <  #800000

Ques. Get employee details from employee table whose Salary between 500000 and 800000.

Select * from EMPLOYEE where Salary between 500000 and 800000;

281 thoughts on “DBMS Interview Questions 2022 | MySQL Interview Questions 2022 | DBMS Most Asked Interview Questions”

  59. I think this is one of the most significant information for me. And i’m glad reading your article. But want to remark on few general things, The site style is ideal, the articles is really nice : D. Good job, cheers

    Reply

  70. Nice post. I was checking continuously this blog and I am impressed! Very useful information specially the last part 🙂 I care for such info a lot. I was seeking this particular info for a long time. Thank you and good luck.

    Reply

  72. Greetings! This is my 1st comment here so I just wanted to give a quick shout out and tell you I truly enjoy reading through your blog posts. Can you suggest any other blogs/websites/forums that deal with the same subjects? Thanks a lot!

    Reply

  84. Thanks for ones marvelous posting! I really enjoyed reading it, you can be a great author.I will be sure to bookmark your blog and will often come back down the road. I want to encourage one to continue your great posts, have a nice day!

    Reply

  97. Simply want to say your article is as amazing. The clearness on your publish is simply spectacular and i can think you are a professional in this subject. Well together with your permission allow me to seize your RSS feed to stay up to date with drawing close post. Thank you a million and please keep up the gratifying work.

    Reply

  100. This design is wicked! You obviously know how to keep a reader entertained. Between your wit and your videos, I was almost moved to start my own blog (well, almost…HaHa!) Great job. I really enjoyed what you had to say, and more than that, how you presented it. Too cool!

    Reply

  101. I love your blog.. very nice colors & theme. Did you design this website yourself or did you hire someone to do it for you? Plz reply as I’m looking to design my own blog and would like to know where u got this from. thanks a lot

    Reply

  105. Its like you read my mind! You seem to know so much about this, like you wrote the book in it or something. I think that you could do with some pics to drive the message home a bit, but other than that, this is fantastic blog. A great read. I’ll definitely be back.

    Reply

  112. My brother suggested I might like this website. He was totally right. This post actually made my day. You cann’t imagine just how much time I had spent for this information! Thanks!

    Reply

  115. This is very interesting, You are a very skilled blogger. I have joined your feed and look forward to seeking more of your magnificent post. Also, I have shared your site in my social networks!

    Reply

  120. I used to be recommended this blog via my cousin. I am now not sure whether this submit is written through him as no one else recognize such particular approximately my difficulty. You are amazing! Thank you!

    Reply

  122. I don’t even know how I ended up here, but I thought this post was good. I don’t know who you are but definitely you are going to a famous blogger if you are not already 😉 Cheers!

    Reply

  131. I have been surfing online more than three hours today, yet I never found any interesting article like yours. It’s pretty worth enough for me. Personally, if all site owners and bloggers made good content as you did, the net will be much more useful than ever before.

    Reply

  135. This is hands down one of the greatest articles I’ve read on this topic! The author’s extensive knowledge and zeal for the subject shine through in every paragraph. I’m so appreciative for coming across this piece as it has enriched my knowledge and stimulated my curiosity even further. Thank you, author, for taking the time to create such a remarkable article!

    Reply

  139. Hello there! I know this is kinda off topic however , I’d figured I’d ask. Would you be interested in exchanging links or maybe guest writing a blog article or vice-versa? My site goes over a lot of the same subjects as yours and I believe we could greatly benefit from each other. If you happen to be interested feel free to send me an e-mail. I look forward to hearing from you! Terrific blog by the way!

    Reply

  142. Great goods from you, man. I’ve understand your stuff previous to and you’re just too fantastic. I really like what you’ve acquired here, really like what you’re stating and the way in which you say it. You make it entertaining and you still take care of to keep it smart. I can not wait to read far more from you. This is actually a terrific site.

    Reply

  181. Hey there! I know this is somewhat off topic but I was wondering which blog platform are you using for this site? I’m getting fed up of WordPress because I’ve had issues with hackers and I’m looking at options for another platform. I would be great if you could point me in the direction of a good platform.

    Reply

  186. I’m not positive where you are getting your info, however good topic. I needs to spend a while learning more or understanding more. Thank you for great information I used to be looking for this information for my mission.

    Reply

  188. I think this is one of the most significant information for me. And i’m glad reading your article. But wanna remark on few general things, The website style is great, the articles is really excellent : D. Good job, cheers

    Reply

  191. Having read this I thought it was very informative. I appreciate you finding the time and effort to put this article together. I once again find myself spending a significant amount of time both reading and commenting. But so what, it was still worth it!

    Reply

  205. My brother suggested I would possibly like this blog. He used to be totally right. This post actually made my day. You cann’t believe just how so much time I had spent for this information! Thank you!

    Reply

  219. Хотите получить идеально ровный пол без лишних затрат? Обратитесь к профессионалам на сайте styazhka-pola24.ru! Мы предоставляем услуги по стяжке пола м2 по доступной стоимости, а также устройству стяжки пола под ключ в Москве и области.

    Reply

  222. What i do not realize is actually how you’re not really a lot more well-favored than you may be right now. You are so intelligent. You know therefore significantly in terms of this matter, produced me in my opinion believe it from numerous various angles. Its like men and women don’t seem to be fascinated unless it’s something to accomplish with Lady gaga! Your personal stuffs excellent. All the time deal with it up!

    Reply

  235. Do you mind if I quote a couple of your posts as long as I provide credit and sources back to your webpage? My website is in the very same area of interest as yours and my visitors would certainly benefit from a lot of the information you present here. Please let me know if this okay with you. Thank you!

    Reply

  236. Эффективный, быстрый и качественный процесс ремонта это то, что мы предлагаем в виде механизированной штукатурки на mehanizirovannaya-shtukaturka-moscow.ru.

    Reply

  243. Its like you read my mind! You seem to know so much about this, like you wrote the book in it or something. I think that you could do with some pics to drive the message home a bit, but other than that, this is fantastic blog. A great read. I’ll definitely be back.

    Reply

  249. This is the right site for anybody who would like to find out about this topic. You realize so much its almost hard to argue with you (not that I actually would want toHaHa). You definitely put a brand new spin on a topic that has been written about for many years. Excellent stuff, just excellent!

    Reply

  279. You really make it seem so easy with your presentation however I in finding this topic to be really something which I think I might never understand. It sort of feels too complicated and very extensive for me. I am looking forward for your next post, I will try to get the hold of it!

    Reply

  280. Hi! I know this is kind of off-topic but I had to ask. Does building a well-established blog like yours take a lot of work? I’m completely new to blogging but I do write in my diary on a daily basis. I’d like to start a blog so I will be able to share my own experience and views online. Please let me know if you have any ideas or tips for new aspiring bloggers. Appreciate it!

    Reply

Leave a Comment

Ads Blocker Image Powered by Code Help Pro

Ads Blocker Detected!!!

We have detected that you are using extensions to block ads. Please support us by disabling these ads blocker🙏.

Powered By
Best Wordpress Adblock Detecting Plugin | CHP Adblock