Learn how to write SQL Queries(Practice Complex SQL Queries)

[@mounikakondrapu7660]

I have cleared one of my interviews with top MNC company because of this training video. Thank you so much.

[@techTFQ]

Amazing … congratulations Mounika 💐 I am so glad to read this comment ☺️🙏🏼

[@chusman4743]

Congratulations monika on clearing your interview! 🎉 I'm currently preparing for a similar interview for an SQL Server position and was wondering if you could share any tips or a list of the questions you were asked? Your insight would be incredibly helpful. Thank you so much in advance!

[@magicmedia7950]

Who else thought that they knew SQL until they came across this and then realized that they have a long way to go?😅

[@siddhantmishra6581]

Me today😂😂

[@anantrambeheruk]

I am one of them😢

[@presidentbrown]

After going through this I realised how much we can do with SQL. I thought I knew SQL but now I know there's a lot to learn.

[@_RahulDewangan]

Exactly my thoughts.....but i have my interviews soon 😭😭

[@shankar_dey]

Same here

[@mohammedidris2840]

Its not at all a tutorial video its a master or an expert explaining. You dont explain the approach or idea you just make everything clear in all the concepts you explain. Awesome

[@konstantindemchenko5496]

15:27 the first condition d1.id d2.id is redundant since its more narrow than d1.speciality d2.speciality

[@mdsaidulislamsayed6063]

you are so well spoken! no unnecessary talk, straight to the point, in depth explanation!

[@techTFQ]

Thank you Saidul. glad you liked it :)

[@sahilkadu5409]

You are the greatest SQL teacher i have seen. Period

[@techTFQ]

haha Thank you Sahil :)

[@yrrep27]

Just want to say first, this channel is invaluable. Thought I'd offer up a solution for problem 7 that's a little more concise. This assumes that as in the example data, consecutive increasing id numbers correspond to consecutive increasing dates, with each id number corresponding to a unique day. The approach is: 1. Remove records with temperatures above 0 using a WHERE statement. 2. Of the remaining rows check each one to see if it is part of a consecutive triplet-- we could use the date column for this with a specialized date function, but it's easier to use the id column, if the assumption stated above is true 3. A row in a consecutive triplet will meet one of three criteria: Either A-- the two leading rows have consecutive id numbers, B. The lagging row and the leading row both have a consecutive id, or C. The two lagging rows have consecutive ids. 4. The CASE statement checking for these criteria are then packaged in a subquery returning just the id of qualifying rows. 5. The main query uses IN to return only rows having the ids returned by the subquery. SELECT * FROM weather WHERE id IN (SELECT CASE WHEN id + 1 = (LEAD(id) OVER ()) AND id + 2 = (LEAD(id, 2) OVER ()) OR id - 1 = (LAG(id) OVER ()) AND id + 1 = (LEAD(id) OVER ()) OR id - 1 = (LAG(id) OVER ()) AND id - 2 = (LAG(id, 2) OVER ()) THEN id END as check FROM weather WHERE temperature < 0)

[@mrmuranga]

Anyone starting out or wishing to improve there SQL , this is definitely for us. Great job👏👏👏

[@anishvarghese8169]

This is the only SQL related video on KZbin I have watched throughout without clicking the skip button

[@NitinKumar-vw9gb]

Thank you so much sir ,I watched your video and able to solve multiple query in interview,now I'm selected 😊 as software developer trainee

[@sandipansarkar9211]

Also finished practicing coding .Now feeling hell lot of confident in my pursuit of data analyst

[@techTFQ]

That’s great buddy

[@pedramhaqiqi7030]

Great video, for #4. Since the same doctor will not have different specialist, we can just compare hospital names and specialist and it will make sure we do not have the same doctor being compared with him/her self.

[@pushkarratnaparkhi2205]

I failed a DA interview because I was not able to solve a question similar to Query 9. But Now I am smarter than before because of you. Thanks a lot. Really very useful content

[@techTFQ]

I am glad you found the video helpful bro

[@abdullahmusheer4238]

Every other SQL tutorial youtuber just shares the basics which is good , but going through these examples and approach is really well thought of.. Appreciate the work! Thank you

[@techTFQ]

Thank you Musheer 🙏🏼 Glad you liked my work

[@InsightsbyMahmoud]

14:35 you don't need to set condation d1.idd2.id

[@vijaypalmanit]

superb, had been looking for someone for very long who teaches complex queries in simplest manner, finally search ends here.

[@techTFQ]

Thank you Vijay 🙏🏼 Glad You liked my videos ☺️

[@aravind7627]

After going through multiple videos. finally landed in the best channel. I am able to follow you effortlessly for more hours. Thank you so much.

[@amsalespush]

So far, the best video I have found on complex SQL. Great examples of practical value, very well explained. Thanks a lot.

[@monishramesh3844]

Watching this video in 2024 as a part of my interview preparation. Great videos!!! Here is my approach to login_details question using CTEs with cte as( select *, LEAD(user_name) over(order by login_id) lead1, LEAD(user_name,2) over(order by login_id) lead2 from [dbo].[login_details]) select distinct(user_name) from cte where user_name = lead1 and user_name = lead2

[@sreerams2677]

Hi, Thank you for your time and effort. Please continue these complex queries as a series. Thank you once again, i am getting a hold on sql after watching your videos especially on CTE's and sub queries which plays a major role in getting required outcome.

[@techTFQ]

Thank you Sreeram 🙏🏼 I am so happy to know you have benefited from my video’s .. Yeah will continue making more such videos. Tomorrow will be posting a video about a particular complex Sql query so hopefully you will like that one too..

[@MariadelCarmen-gj8ul]

@@techTFQ quick question, does "select d1.* from doctors d1 JOIN doctors d2 ..." works exactly than "select d1.* from doctors d1 INNER JOIN doctors d2..."? Thank you in advance

[@danielessiet4063]

I have sent you a request on LinkedIn.

[@Devasinger-0070]

​@@MariadelCarmen-gj8ulyes

[@MariadelCarmen-gj8ul]

@@Devasinger-0070thank you so much!

[@swatisingh-vs1bx]

This is by far the best video for understanding SQL queries, the way you have explained by running small parts first and than solving to get the end output and also the pace was very much decent. Thanks man ! and please continue to make more of such videos :)

[@techTFQ]

Thank you Swati 🙏🏼 Truly appreciate such detailed feedback 🙂 So glad this helped you.

[@yaroslavpanych2067]

It is not. It is really not!

[@laurak5196]

I’ve finally watched the whole thing and this is definitely my favorite kind of your videos. I learn the most by watching you and hearing your thought process and the nice bonus is then I can go and download your script, create an identical table and then go try and do it myself. That’s where I learn the most, bc I can try my own ideas and just make little changes and see if that completely throws an error and then I try and understand why that error was thrown so I can avoid that problem in the future. Thank you again for your help and your time investment. Over 113K views on here shows I am not the only one this is helping. 🙏🏻 Many blessings to you and your family, TFQ

[@techTFQ]

Thank you so very much Laura 🙏 I am really impressed by the way you are trying to use this resource to learn and practice SQL. Very happy to be contributing to your learning too.. Happy learning and wishing you all the very best :)

[@laurak5196]

@@techTFQ And it’s working because I repeated the course on joins and also intermediate sql on DataCamp and after watching your videos on key topics, I was able to make significant progress. Their lectures are very short and the material was completely new to me the first time. Also I was trying to take too many classes and not allowing time to absorb the information. Watching your more detailed explanations helped me a lot and now I believe I’ll be able to solve most of the queries you’ve posted. I’ve created all of your tables in my database so that I can make sure of that. I have a deadline to meet to pivot my career and so I am a little in rush mode and I’m so glad I found your videos when I did because they are exactly what I needed to supplement those courses. Again, I realize how much time and thought went into this and as the mascot I’d like to speak for all of your viewers and offer our appreciation for all of it 🙏🏻😀

[@techTFQ]

Thank you Laura ☺️ You have the right attitude for learning SQL and I am sure you will solve every query in this blog.. All the best 👍

[@laurak5196]

@@techTFQ thank you again for your encouragement and have a wonderful evening 🙏😀

[@techTFQ]

You too Laura ☺️

[@SagarKumar-db2xy]

Watched tons of SQL contents, this is by far best and quality content. Keep adding more. Please also share the SQL for entry level data analyst

[@techTFQ]

Thank you Sagar 🙏🏼 Glad you liked it.. Sure SQL for data analysis, let me plan something

[@zion96776]

@@techTFQ do you have course on it ?

[@techTFQ]

Hi Carlos, do not have any course as of now . May be will plan to create one in future..

[@amyfarrahfowler7732]

This is by far the best tutorial for SQL-queries. You save my studies and my peace of mind

[@techTFQ]

Thank you Amy. glad you liked it :)

[@ritikajaiswal3824]

OMG, this was my reaction when you cleared my doubt on lead and lag... I don't know whether you're a good employee or not but YOU'RE AN AMAZING TEACHER. I regret not taking your intermediate live sessions. Do tell me if you're starting a next batch on intermediate queries.

[@techTFQ]

I am glad this video helped Ritika .. as for next batch , have not planned it

[@Aditya-um6wc]

@@techTFQ Hi, from where I can get files and I can use them as database? So I can perform queries

[@GazbertUK]

FYI - I'm doing the exercises using MySQL (using POPSQL) and for query 5, using the line INSERT INTO login_details values(113, 'James', current_date+6); was giving me an error because it was trying to store 2021-11-32, so I had to change the line to INSERT INTO login_details values(113, 'James', DATE_ADD(current_date, INTERVAL 6 DAY)); Great series of vidz, I'm learning so much and my head is starting to get into the SQL groove.

[@techTFQ]

Thank you Gazbert for sharing the solution. This is right. And I so glad you are liking the content :)

[@rodneyoganga6693]

I wish i could be as good as you at SQL, am struggling, God help me, thank you for such a well explained tutorial with amazing dedicastion.

[@techTFQ]

Hi Rodney, Thank you for such kind feedback 🙏🏼 Am so glad this could help you .. I feel if you keep spending time to learn Sql every day for 1-2hrs, I am sure within a month you would be very comfortable and you should be able to solve most Sql queries .. Just needs time, patience and belief that you can do it .. keep the faith and I am sure you will master SQL soon..

[@SabaNaseem-y9g]

How are you doing at SQL now???

[@kartikeytyagi9119]

How your sql now?

[@ProfitableStockTrader]

Rodney does not respond to simple queries now. He's in an advanced query mode now. Here is the query that might initiate a response from Rodney: - Hey Rodney, does your existence on the Planet Earth been achieved, now that you have questioned on a YT video and also got an interesting and encouraging reply from the YT channel admin which might have initiated you to spend more than 2 hours o a daily basis with endless belief that you can achieve the impossible and with the time and patience you had in your hands, you spent the time wisely and now have reached the Query Nirvana in any QL?

[@techTFQ]

Too funny man 😅 Bravo to you if you get the desired response 😬

[@deanterrell4902]

This is the best advanced SQL video I have ever seen. Thank you very much!

[@techTFQ]

Wow, thanks!

[@abinsharaf8305]

as a mac user, your videos were mashallah very helpful, especially the way you think gives a practical approach to finding solutions. As a beginner i find it very nice thanks brother and keep up good work.

[@techTFQ]

Thank you Abin 🙏🏼 Glad the video helped ..

[@chikwaz4500]

This is what I was looking for. Real world challenging examples explained in a clear and concise manner. You have earned my subscription.

[@narravularushitha6806]

Hi TFQ, For Query 5 : From the login_details table, fetch the users who logged in consecutively 3 or more times. Instead of lead function we can use Rank as well ryt. This also gives correct output. Below is my Query and please let me know if this is the right way to use Rank function or not. select distinct user_name from (select *,rank() over(partition by user_name order by login_date ) as rnk from login_details ) where rnk >=3 ;

[@LostZoro266]

it will work only for this type of data but if it was different then i don't think this will work

[@dipalipatil7917]

no its not working

[@EstherNyarkoah-v5c]

Please solve more questions coz this is magical ❤😂

[@michaelbarry1437]

Thank you!!! I discovered Process Query Language (PQL) that uses Lead & Lag times (different structure) and the concepts really help with understanding.

[@techTFQ]

Your welcome Barry🙏🏼 Glad this helped ..

[@billb6283]

Was glad to see your "Download script"...at least for the 1st example also worked with SQLite. It also needed the rowid change for the SELECT. SQLite is stand alone and doesn't require a server.

[@techTFQ]

Thank you Bill 🙏🏼 Glad to know you found this useful ☺️

[@prashantmarathe6515]

superb examples of complex query ! Appreciate yours knowledge and this contain , thank you

[@techTFQ]

Your welcome Prashanth 🙏🏼 Glad you liked it …

[@krishpoptani7862]

Absolutely stunning and insightful video, I come here every 15 days to revise my SQL concepts.

[@fathimafarahna2633]

1M views… Masha Allaah… You deserve much more.. Keep growing n benefiting 👍👍👍

[@simplytech4u898]

Thanks mitra khup chan shikavtoy ,mala tuza blog madhun khup kahi shikayla milale ,dhnaywad..!! select emp_id,emp_name,dept_name,salary from ( select *, min(salary) over (partition by dept_name) as min_salary, max(salary) over (partition by dept_name) as max_salary from employee ) as x where salary =x.min_salary or salary =x.max_salary

[@fathimafarahna2633]

Nothing like your contents on this whole KZbin. Genuinely appreciate your efforts in churning out such beneficial n functional contents🙏Also, the blog is just amazing. Clean, clear, authentic. Kudos to your efforts n intention👏🙌

[@techTFQ]

Thank you very much ❤️ And there is nothing like your support 😍🙏🏼

[@mayankbungla]

THANKS SIR THIS MADE MY WINDOWSFUNCTIONS CONCEPT MORE CLEAR

[@lokeshgunjugnur2807]

Fantastic..This helps infrastructure oriented DB engineers like us to quick assist customers with query tuning or performance tasks. Thanks for making time to share this dude.

[@techTFQ]

Your welcome Lokesh 🙏🏼 Glad this helped

[@soorakabalam]

simple and effective with easy flow narration.

[@techTFQ]

Thank you 🙏🏼

[@pranabthakuria1897]

Loved your step-by-step approach towards solving complex SQL queries. Hope to see more similar videos in the coming days and really appreciate your hard work in making such a helpful content.

[@techTFQ]

Thank you Pranab for your kind words.. Glad the video helped ☺️

[@maniguvvala3853]

Cf

[@siskaagustiningsih4501]

Īi

[@siskaagustiningsih4501]

@@techTFQ III III i

[@siskaagustiningsih4501]

Īi in i

[@khansvirtualdiary]

find your tutorial very clean n easy to catch

[@techTFQ]

Glad you think so Ataullah

[@mathieudager4234]

TechTFQ: super great job. This is high quality knowledge sharing. Like you said knowing the different clauses and expressions doesn’t mean being able to apply them to concrete queries. Keep these great tutorials coming please. If you could increase the degree of complexity with aggregate functions that’d be super appreciated. Can’t wait to watch your next vids. Got yourself a new subscriber. Thanks a lot.

[@techTFQ]

Thank you Mathieu 🙏🏼 So glad to read this comment.. will consider your suggestion to include more complexity in the future.. glad you are subscribed ☺️

[@vishalchakraborty2050]

Hey Mate , Because of you now I am fully confident about my problem solving abilities in SQL . Thanks a lot for these Complex SQL Queries ❤️❤️

[@marciojrtorres]

Thank you Thoufiq, I learned a lot from the examples you've provided. Greetings from Brazil 👋

[@techTFQ]

So glad to receive feedback from Brazil 😃 I am so glad you liked it Torres 🙏🏼

[@basavarajbijali7342]

The best material for SQL in KZbin that I have sawn, amazing blog as well, please go on such queries, which will really help many learners including myself.

[@techTFQ]

Thank you Basavaraj 🙏🏼 Glad you liked it 🙂

[@dhruvmadaan3276]

I subscribed to your channel while you were still explaining query #2 Your speed and way of explaining as well as the examples you picked are SPOT ON ! WE NEED MORE VIDEOS, QUERIES and EXAMPLES FROM YOU !! PLEASE POST MORE VIDEOS... THANK YOU !!

[@techTFQ]

Thank you so much bro.. I am glad you liked the content. Sure will post more such videos

[@ricardostefani1396]

Cristal clear. Pure quality. Thanks!

[@techTFQ]

Your welcome 🙏🏼 Glad you liked it

[@mmmaxmmm83]

These are sooooo helpful. You're doing God's work!! 😁

[@techTFQ]

Thank you Maxim for such kind words man 🙏🏼 So glad I a am able to add some value through these videos ..

[@myindia5604]

Realy very good content delivered. I never seen anyone who explain like this. Great work. ❤️

[@techTFQ]

Thank you Hari 🙏🏼 So glad to hear such positive feedback.. glad this helped 🙂

[@sunilpal2860]

best tutorial on youtube, very well explained, Take a bow man

[@techTFQ]

Thank you Sunil :)

[@glorysowji9218]

Thank you so much for sharing such an extreme knowledge with us. Now I'm able to get some idea on the complex queries and practicsing as well. All your videos are very much helpful for me. Thanks a lot for taking so much effort and time to make these videos. Easy to understand and grasp the hidden concepts practically. Plz do share more on window functions queries used in real-time. God Bless You.👍🤝

[@shawnmendoza3321]

Great easy to crack interview by following you

[@techTFQ]

Thanks a lot Shawn 🙏🏼 Glad this helped ..

[@PriyaRajDiaries]

Your teaching methodology is superb.... I have shared it with my husband who is looking for a course in SQL. He too found it very useful, easy to understand.

[@techTFQ]

Thank you so much 🙏🏼 Glad you liked it

[@rajneeshpatel5028]

The step by step explanation of each query helped develop good grasp over the concept . Thankyou very much for the precise explanation

[@techTFQ]

Your welcome bro :) Glad this helped

[@sudeeppoonoth3595]

Totally agree with many of the viewers comments. You are the best SQL guru I have seen on KZbin. Wish you were our teacher in college when we learned these without this much clarity.Hats off to dedication and hard work..👏👌

[@techTFQ]

That’s a very kind appreciation 🙂 Thank you Sudeep 🙏🏼 Am glad I can add some value through these video’s

[@ritushah2059]

Thank u so much . I checked today and solved one query. very well explained. please keep posting

[@sivakarthikayanb8214]

Man, this tutorial is really awesome!!! Thank you so much for your detailed explanation. It will be very great if you post more videos on solving complex queries!!!

[@techTFQ]

Thank you Siva 🙏🏼 Glad you liked it .. yes will be making more videos on solving sql queries

[@swapnilsarbajeet7319]

select * from( select *,max(salary) over (partition by dept_name ) as max_salary, min(salary) over (partition by dept_name ) as min_salary from employee)x where salary in (x.max_salary,x.min_salary) - I tried this approach for Q3

[@BrotoBhattacharjee]

This is an awesome tutorial video. It touches upon exactly the pain points and explains the concept in a great detail.

[@techTFQ]

Thank you Broto 🙏🏼 Glad you found this helpful ☺️

[@balanced-living]

great job @techTFQ with your approach - blog followed by video. This is easy to follow and creates desire to solve the problem first with the concepts we know and look for your solution to improve up on it. I like your blog too. Thank you & keep doing the great work.

[@szebart]

Fantastic tutorial, very well explained step by step. All is clear to me after watching your vids. Thank you my friend!

[@techTFQ]

Thank you so much bro 🙏🏼 Very glad to know you liked the content 🙂

[@mayadashaat5348]

ة

[@kumarrajiv2821]

Thanks Taufiq, Please continue with complex SQL query

[@techTFQ]

Noted bro

[@muskanchaudhary5265]

you literally make the best videos!! please keep making more with more queries and performance tuning tricks and interview focused complex queries. Thank you so much for your amazing content!

[@techTFQ]

Thank you Muskan 🙏🏼 So happy to read this feedback ☺️ And yes I will make more query videos

[@lucienchu9649]

Thanks a lot, have not touch SQL around 3-4 years after school, a new task requires me to start from fresh. Spending 5 hours on one query joining 5 tables is REALLY not fun and frustrated :(

[@techTFQ]

Your welcome and I hope my videos can help you grasp SQL faster

[@MaheshBabu1989]

Nice examples.. I feel writing below query for finding duplicate records is bit easier . Select user_id,user_name,email from (Select user_name,count(user_name) un from users group by user_name) asd Where asd.un>1

[@techTFQ]

Thank you 🙏🏼 We can always a solve a query in several different ways and that’s the beauty of sql

[@youmnaification]

You could use HAVING count >1 instead the WHERE clause. HAVING clause always works with GROUB BY.

[@kaushalmzp]

Taufique going international as well , great to see man !!

[@techTFQ]

haha Thank you Parikshit bhai :)

[@laurak5196]

TFQ, I predict greatness for your channel with content like this. Seriously, you stand apart because your explanations are so clear and you put so much time and effort forward for your videos and this shows. I think I speak for all your subscribers when I say thank you, thank you. We SO appreciate all of your hard work. 100K will be in your rear view mirror before too long, my friend. 👍🏻😊

[@laurak5196]

I also want to add that I’m so happy right now because I was having troubles with a Leetcode query I was trying to solve and after your terrific explanation about self-joins, which I’d struggled a bit with in the past, I was able to go right back there and quickly solve it. I don’t know if you’re interested in teaching, but you’re a natural at it. Thank you so much! I now understand something in a few minutes that had really confused me in the past! Blessings to you and yours for a wonderful November, TFQ!

[@techTFQ]

Thank you thank you Laura 🙏🏼 🙏🏼 It’s so true that each of these videos take a lot of effort to make but getting this kind of feedback makes everything worth it.. I am short of words to thank you for your support and I just wish you success in everything you do.. I am also so glad to hear that you could apply the teachings in this video to solve leetcode queries.. I feel overwhelmed by this feedback .. Thank you once again and have a great start to the month.. 🙏🏼☺️

[@laurak5196]

@@techTFQ I used to have an art blog and it took quite a bit of effort, so I can only imagine the time to film, plan etc., but your explanations simplify complex operations so well that I feel your efforts are bound to bear fruit. Look how much your channel has grown already! You’re doing great, and we thank you again. 🙏🏻👍🏻

[@techTFQ]

Thank you Laura 🙏🏼☺️

[@laurak5196]

@@techTFQ I’m a new subscriber and you’ve gained over 1,000 followers since I’ve joined you last week 😱 which imo is amazing, TFQ!

[@MrMela69]

I used this approach for problem 1. select user_name, count(user_name) as duplicate_number from users group by user_name having duplicate_number>1

[@LovelyJordy]

Hi there, thank you so much for sharing your knowledge. I am self learning, and your examples have helped me so much with the advanced concepts. Thank you!!!!!!

[@AbigailSQL]

Thank you for this video. It's detailed and well explained. Hope to see more! I used Postgre to run the queries and it was successful, but when I tried the query for duplicate records on MSSQL, it returned an error saying (the ORDER BY clause is invalid in views...) Kindly suggest what to do.

[@techTFQ]

Thank you for liking the content 🙏🏼 These queries were written in PostgreSQL but I will soon update my blog to have corresponding queries in MySQL and Microsoft SQL server also .. may be in couple of weeks

[@AbigailSQL]

Thank you for the response. I look forward to seeing the video.

[@receps.8396]

Thanks a lot man. One lesson teaches us subquery, ranking and distinct. All in one.

[@ashishgoyal4818]

This channel is very good for learning SQL, the way of explaining and displaying content is superb. If this channel could give us videos on interview questions of top companies then we won't be needing to go to other websites.

[@techTFQ]

Hi Ashish , Thank you for such kind words 🙏🏼 It’s so nice to see you have liked my work and it is beneficial to you 🙂 As for interview questions, I will plan it out in the near future..

[@InspiringThings101]

Thanks!

[@techTFQ]

Thanks Alex 🙏🏼 Appreciate it

[@InspiringThings101]

@@techTFQ you are my teacher now sir! Thank you 🙏

[@sia_ibk]

Hi I really enjoyed this video. I was wondering, is it possible to also use the row_number windows function to solve the third example on login frequency?

[@techTFQ]

Hi Solomon, Yes you can write a query using row_number window function to solve this as well. In fact, I have posted a video on my channel giving a generic query using row number window function to fetch any no of consecutive records from a table. You can watch that video from the link below: kzbin.info/www/bejne/bqHCgK2nfq-SppY

[@adityananda4955]

Please post more videos of solving queries.......it is actually good stuff

[@techTFQ]

Thank you and will do 🙏🏼☺️

[@vaibhavverma1409]

Very Complex inner join,left outer join, right outer join, with more than 3 tables,..plz post this as well

[@techTFQ]

Just few hours ago I posted video about JOINS. In that I have written a query at the end where I joins multiple table using different type of joins. Do check that video out. link below: kzbin.info/www/bejne/ZoC0e3eaaLakh68

[@ManuelrPM24]

I think in the 4th exercise (query a) there is no need to put the a.ID b.ID because the condition d1.speciality d2.speciality automatically restrict that record from coming

[@Kps225]

Sir, could you please make a video on indexes and views and interview questions based on that also.. It would be really helpful and all your videos are great.. Keep rocking❤️

[@techTFQ]

Thank you so much for your kind words 🙏🏼 So glad you liked my videos . Surely will consider your suggestions, let me see when I can cover these topics too..

[@minathanh7072]

I can't not giving a thumb up for this video! Thank you!

[@Anonymous-le2zr]

Best channel for SQL Very well explained Appreciate your hard work !!!! Expecting similar videos to become Master in SQL Thank you very much 😊

[@techTFQ]

Thanks a lot for these kind words 🙏🏼🙏🏼 I am so happy these videos are helping so many people ☺️☺️

[@anduamlaktadesse9284]

Big clapping !!! We desire to have such kind of tutorials on PL/SQL too! The self-join trick is really amazing, and I'm new for lead() and lag() function too.

[@techTFQ]

Glad this helped bro

[@ed2921]

Excellent. Quick question on the temperature query, would an alternative query using self join be more concise? Rather than nested case statement. Keep up the great work.

[@techTFQ]

Thanks Ed for liking the content 🙏🏼 You can always write a query on many different ways and using self join may be an option for this kind of query but if you wish to fetch any no of consecutive records then I have made another video covering it. I’ll leave a link to it below.. have a look at this generic solution as well. kzbin.info/www/bejne/bqHCgK2nfq-SppY

[@parmoddhiman678]

24:58 with cte as (select *, case when temperature

[@jaipurite.k_lalit]

your doing hell lot of work (day and night ),have some rest dude, by the way awesome lesson

[@techTFQ]

Thanks a lot Lalit :)

[@keepsmile564]

Very nice explanation...thank you for the sharing the such great session .

[@techTFQ]

Your welcome :) Glad you liked it..

[@anuprauthan1895]

This Query really helpful for us thank you for your time 👍

[@kamalikamukherji6482]

Sql is tough, ur smart n damn hardworking rightly said u deserve way much more❤

[@ItsMeLovelyRajeshLovesRebecca]

Wowowowowowowww Amazing! It is like one shot bullet entering into brain! Great Explanation! Thanks a lot! Learnt a lot! Loved it! God Bless!

[@rsrinivas6025]

Thank you so much Sir. Please continue these complex queries as a series .

[@techTFQ]

Thank you Ramireddy 🙏🏼 Yeah will do more such videos.. Yesterday I posted another video covering 20 sql queries.. do check it out

[@abhishekchandrashukla3814]

Sir Sir Sir Sir, really really great help for giving questions for practising. Thanks a lot for this.!!

[@manikantaakhil537]

I found this is the best tutorial on youtube tq sir and i request you to add more queries for practice

[@techTFQ]

Thank you so much 🙏🏼 Very happy to know you liked it.. Sure will make more such videos

[@shortvedio9676]

a very admiring content provided in your lecture ....and explanation is very glamourous

[@vijaybarman8180]

Thank you so much, that is something and this is the first time where i enjoyed learning. Thank you sir

[@techTFQ]

Glad to hear that Vijay

[@padmashreepadma6151]

Well explained ... We need more and more complex queries with different functions and joins

[@techTFQ]

Thank you :)

[@sindhushashi3867]

Really very helpful sirr...very clear explanation. I didn't find this info in anywhere, thank you soo much sirr.

[@techTFQ]

Your welcome Sindhu 🙏🏼 Glad this helped..

[@mdfurquan9439]

Excellent explanation ... May Allah bless u

[@techTFQ]

Thank you bro