Need interviewer like you who knows logic is magic. some interviewer patterns makes us to loose confidence who expect bookish answers

This is a great video for interview purpose. Thanks a lot!

@interviewhappy

2 жыл бұрын

wc Pallavi.. and thanks for your comment

Great Explanation! I gave an interview just a few days back and all the questions were explained here except for one or two. Thank you!

@interviewhappy

Жыл бұрын

Thanks Aditi

@aravindnaveena5750

Жыл бұрын

What position ?

Very information and useful for my SQL interviews. Thanks Happy.

@interviewhappy

Жыл бұрын

That is my objective Kesavan, all the best for your interviews.

Thank you so much

Couple things that catched my eyes. 1) Primary Key always creates a clustered index - no, only if CI dosen't exist, if it does nonclustered unique is created. 2) clustered is faster than nonclustered - it depends on what we're doing. If we searching only for indexed columns or non indexed are included into nonclustered index - they will be performing the same or nonclustered will be faster... Overhead is only when nonclustered index needs take rest of the data from a heap or clustered index... 3) Cross join is also part of sql server logical joins (in documentation at least). Logical joins are a wage topic. Some people will also include any operation that is based on physical joins so semi joins, set operations (union, intersect, except, concatenation as union all), aggregates are also included. 4) Self Joins... Oracle people talk a lot about it... I've never heard this phrase in a sql server community... 5) Drop table could be also rolled back in sql server. Answer to this question: Dml VS ddl. Operation on data itself vs definition of the data. Dml are fully logged, ddl minimal... 6) Nth salary... Order by clause is not allowed in derived tables (subqueries). What if more than one person has the same salary? Use dense_rank 7) Consistency stands for capability of rdbms to be consistent apart from transaction result. So if transaction passes - save the data, if not or was hanged - roll itself back to the former state... It is quite obvious when everything's fine but it's really crucial after server crush... After reboot consistency of every db is checked... It has 3 phases - Analysis (what needs to be committed, what needs to be rolled back) Redo - store committed but not saved transactions. Undo - rollback uncomited transactions that were saved (it's called "dirty pages) - it happens when server operates under memory pressure - data are stored despite they're not committed... 7) Improving performance: 1) look at obvious issues with your query/procedure. Do some stuff. It if helped - you're good to go, if not 2) look at estimated execution plan - apply some indexes etc. 3) look at real execution plan - check if your sp is not victim of parameters sniffing etc. 8) memory consumption isn't so important with cursors... Thier iterative nature is... They're terribly slow compered to set/batch operations. That's why never use cursors unless you need to.

Though i am familiar with SQL server quite few years, still lot of points to learn with your video, really nice content. thanks.!

@interviewhappy

8 ай бұрын

Great to hear! Thanks @Arm_luckyno23

Thank you a lot for the effort to make this valuable video. Keep it up.

@interviewhappy

Жыл бұрын

wc and Thanks Rasika. Wish you all the best for your career.

great knowledge for interview . ❤❤

@interviewhappy

Жыл бұрын

Thanks Fahim. Wish you all the best for your career.

Great video. Thanks for sharing! There is a minor correction in the video on Delete vs Truncate. While the Delete can be rolled back Truncate can't be rolled back. The video incorrectly mentions that both can be rolled back.

@interviewhappy

Жыл бұрын

Thanks Nallavan for sharing.

@sayujyakasekar3852

Жыл бұрын

Check in MS SQL server it can be rollback

Seriously..you have explained very nicely, it's very useful 😊 thank you !

@interviewhappy

Жыл бұрын

Your Welcome . Glad you liked it Vidhyadhar.

Again very nice collection and well explained.. 😇😇

@interviewhappy

Жыл бұрын

Thanks a lot 😊 Satinder

Hi Sir, Thank you so much for these wonderful videos. Could you please make a video on How To Return A Value From A Stored Procedure in Sql Server.

@interviewhappy

Жыл бұрын

Hi Jyothi, use out parameters is the answer.

Thank you so much sir

@interviewhappy

Жыл бұрын

Welcome Amruta. All the best.

I think unique key cols can have multiple null values?

super bro

@interviewhappy

10 ай бұрын

Thanks bro. All the best for your career.

thanks sir

@interviewhappy

2 жыл бұрын

wc King

Sir can you do normalisation video with practical examples ? Thank you

@interviewhappy

Жыл бұрын

I will try soon

Thanks sir..coming Saturday I have interview ..I am watching your videos and preparing . I can easily understand your explanation

@interviewhappy

2 жыл бұрын

Thanks Jamuna, best of luck, if you know any answer try to elaborate it as much as possible.

@veerabhadrarao258

2 жыл бұрын

@@interviewhappy how to reach u brother 🙂

@interviewhappy

2 жыл бұрын

@@veerabhadrarao258 whatever queries you have regarding interviews - careers.. just post it here and we can discuss.

@veerabhadrarao258

2 жыл бұрын

@@interviewhappy i need personal support frm you

@interviewhappy

2 жыл бұрын

@@veerabhadrarao258 this is my email id anuragrawat123@gmail.com. We can discuss on email.

Can you please do Video for Azure.. Your videos are really useful for us.. Thank you for your effort

@interviewhappy

Жыл бұрын

Sure Rathika, soon I will

Awesome video sir

@interviewhappy

Ай бұрын

Thanks

Thank you 😊

@interviewhappy

2 күн бұрын

You're welcome 😊

Hello you said Truncate can be rollback, but actually Truncate cannot be rollback. By the way excellent video and appreciate your efforts

@sandeepbhandigare3589

Жыл бұрын

Truncate can be rolled back. You might be referring DROP command

@sayujyakasekar3852

Жыл бұрын

Check in SQL server it can be rollback

@ashleygahl3638

Жыл бұрын

Truncation can rolled back if used inside a transaction

@Mr.Ash-cz9rf

Жыл бұрын

Most of the places it's showing truncate can't be rollback.

Can you do video on .Net core please. nice videos

@interviewhappy

Жыл бұрын

Thanks Bhargavi. I already created videos on .NET Core also. You can check in my channel.

Difference between table variable and cte

What to do if the auto-increment value reaches its limit?. Considering that it's a banking application I don't want to delete the older data how are you going to resolve the issue?

@interviewhappy

Жыл бұрын

Now a days GUID are used for ID's. That will never let that problem happen.

very helpful vidoe

@interviewhappy

3 ай бұрын

Glad you think so!

Can you please create a video about C# design pattern interview questions

@interviewhappy

10 ай бұрын

Yes vignesh soon will update . Stay connected

SIr please make video on user defined function and its types

@interviewhappy

9 ай бұрын

Sure I will try to cover that in future.

please make video on azure interview

@interviewhappy

Жыл бұрын

Sure will try to do it soon@gkmishra2009

Logic is tha Magic

@interviewhappy

Жыл бұрын

Yup

♥️👍

Your book has kindle addition only . I want paperback book of interview questions. Please tell me how can i get the book.

@interviewhappy

11 ай бұрын

Sorry Sonal, the paperback is not available right now. May be in future. All the best for your career.

Hi,Mr.: All are perfect, however, Q24for '"Truncate rollback " seems like "not rollback"

@interviewhappy

Жыл бұрын

Thanks Kevin, I will cross check that question.

TRUNCATE reset the auto increment IDs but DELETE not

@interviewhappy

Жыл бұрын

Good point Chaturanga

we use insert update delete in the sp and cannot in the function this point is wrong broh in your video

@interviewhappy

Жыл бұрын

you are right

There was one question why we are using cursor instead of a while loop?

@interviewhappy

Жыл бұрын

In 90% cases we can replaced cursor with loops and that is recommended because cursor is performance heavy. I just wanted to explain cursor, that's why :)

@adilkevin6220

Жыл бұрын

@@interviewhappy I was asked this question in the interview? Why cursor when we can use while loop. What should be the answer for this question ?

Shared one email regarding interview questions I faced last week sir. Please give reply.

@interviewhappy

Жыл бұрын

Oh, that's you, I already replied. Thanks for your email.

@FunAndCreativeCorner

Жыл бұрын

@@interviewhappy thank you sir 🙏

Sir practical kar k dikha dete to or bhi achha hota

@interviewhappy

Жыл бұрын

Noted Pooja.. next time

@poojaswain4722

Жыл бұрын

Thank you sir

@poojaswain4722

Жыл бұрын

Sir normalization ka ek video bana dijiye interview me bahut baar puchh chhuke hai

@interviewhappy

Жыл бұрын

@@poojaswain4722 sure this is related with the design of tables in database. Right now I am creating something in Angular but will cover this soon.

@poojaswain4722

Жыл бұрын

Okk sir

What is Normalization in SQL?

@interviewhappy

2 жыл бұрын

When you create your application database tables from scratch, then you have to follow some rules - 1NF, 2NF, 3NF, BCNF... If you will not follow these rule, then later when data is filled in those tables.. you will face difficulty in managing that data.

Thank you so much sir

@interviewhappy

3 ай бұрын

Most welcome