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Recursive SQL Queries Tutorial | Learn to write SQL Queries using Recursion
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Күн бұрынVisit brilliant.org/t... to get started learning STEM for free, and the first 200 people will get 20% off their annual premium subscription.
All the scripts and dataset used in this video can be downloaded for free from my discord. Link to join my discord below:
Discord link: / discord
In this video, let's learn how to write Recursive SQL Queries. Learn to write SQL Queries using Recursion by solving different SQL queries. This video will explain the syntax to be followed to write recursive sql queries and we shall look at the difference in syntax in PostgreSQL, Oracle, MySQL and MSSQL.
I will also explain the process SQL follows to execute recursive sql query. Then we shall solve 3 different SQL queries using recursion. I will execute the queries in all the major RDBMS such as PostgreSQL, Oracle, MySQL and Microsoft SQL Server.
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My recommended platform for SQL Course: learnsql.com/?...
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THANK YOU,
Thoufiq
@techTFQ 2 жыл бұрын
Visit brilliant.org/techTFQ/ to get started learning STEM for free, and the first 200 people will get 20% off their annual premium subscription.
@singavarapunavya9143 2 жыл бұрын
Hi @techTFQ I have been following you since very long time and I got better in SQL just because of you! Thanks a lot. Now I have a problem and not able to solve it since 2 days! Could you please help me with it! SELECT * FROM YourTable WHERE '123' IN ('Col1', 'Col2','Col3'...'Coln') But the Where condition isn't working for 2 values example: WHERE ('123', '456') IN ('Col1', 'Col2','Col3'...'Coln') , Is there any way to search for 2 or more values existing in different columns??
@techTFQ 2 жыл бұрын
Thank you Navya .. You can use OR clause for this case.. WHERE ( Col1 in (123, 456) OR Col2 in (123, 456) OR Col3 in (123, 456) OR Col4 in (123, 456) )
@singavarapunavya9143 2 жыл бұрын
@@techTFQ Thanks for the response, Yes I did use it but I don't want to write multiple OR's because 123, 456 is not constant and these might go upto 100 or 200, so I have to paste them in every single OR condition every time! So is there any way to solve this issue? I want to give the values only once and it should check in all the columns for it's existence.
@techTFQ 2 жыл бұрын
Can you share the entire query and datasets with me so I can check . U can email me
@singavarapunavya9143 2 жыл бұрын
@@techTFQ sure thanks.
@correialc 2 жыл бұрын
Hi Thoufiq. I've been working with SQL (and teaching) for more than 2 decades and never found someone addressing SQL problems like you. The strongest aspects are problem-solving orientation (instead of theoretical) and ANSI standard queries (as much as possible). Congratulations! I'm recommending your videos to my students and workmates.
@techTFQ 2 жыл бұрын
Hi Leandro, Thank you so much 🙏🏼 It’s very special to receive such amazing feedback from an experienced SQL professional like yourself. Thank you for sharing this feedback, means a lot 🙏🏼 And thank you too for recommending my contents..
@karthikeyanpandian1330 2 жыл бұрын
Hey Thoufiq, I have become a big fan of your content off late. I think that I have subscribed and started watching your videos for a month or 2. However, I have completed watching every single video that you have uploaded so far. The way of teaching is excellent and the examples that you provide are the backbone for the concepts that you are explaining. Great work! Thanks for the amazing knowledge share!
@techTFQ 2 жыл бұрын
Thank you so very much Karthikeyan :) I am so glad you have liked my contents. Thanks for the feedback too
@aakriti_100 2 жыл бұрын
I did both these topics (CTE & recursive CTE) from LinkedIn learning; they made me feel like I can't learn but you make SQL so easy. Thanks for your content:-) I'm at my first step as data analyst; looking forward to have help from you.
@techTFQ 2 жыл бұрын
I am glad to hear that Aakriti
@sspinjari7643 2 жыл бұрын
Every single person who is working in SQL must have this channel in youtube subscribe list. I have recommended this channel to 3 colleague's & I am extremely happy to say they all liked this channel. And all 3 are thanking me 😍
@MimmoCRISTOFARO 5 ай бұрын
At last a clear, detailed and impressive explanation with real examples of what is, how it works and how to write a WITH RECURSIVE CTE. BRAVO!!!
@user-lm8kq8bj2y 7 ай бұрын
I've looked at dozens of RECURSIVE CTE tutorials but until this one, I couldn't find an explanation of the JOIN condition. Thank you ... exactly what I needed!
@dhirendratripathi891 2 жыл бұрын
Literally I would say god level explanation, I was struggling with recursive query recently i had use case 👍
@santoshgowda7462 2 жыл бұрын
I have watched so many videos regarding the same topic but really you made me understand very easily...thank you very much. keep teaching us.
@techTFQ 2 жыл бұрын
Glad to hear that Santhosh ☺️
@claybyfrancisshop Жыл бұрын
I've started my data science course and I thought that recursive cte wasn't meant for me but thanks to you i'm finally able to understand the logic behind it. Thanks Thoufiq.
@techTFQ Жыл бұрын
Thanks, glad it helped
@sachinvishwakarma5868 Жыл бұрын
Very well explained. I remember using the same concept when I had to generate the Voucher Code for one promotion feature. The voucher code should be AlphaNumeric and it should not already be present in the existing VoucherCodes table. It was very interesting and this concept had helped a lot.
@DinoDunelm 5 ай бұрын
Thank you so much for the detailed tutorial! I’ve been a data analyst for three years but never came across this technique until I received an interview from another company. Hope I can ace that SQL interview🤞
@theshanerap Жыл бұрын
You’ve taught me more in one week, than I learnt in one semester. GOAT STUFF!
@timothymalahy7880 Жыл бұрын
Definitely one of the better examples and succinct explanations. I liked how you reviewed the syntax first and came back to it when implementing. Keep it up.
@SoumyaPriyaGodera Жыл бұрын
Hi Thoufiq,I am a beginner learning Data Science course. Your teaching skills are very good and anyone can understand the way you explain. I really thank you for the SQL videos which are very useful and also I recommend to my friends to watch your videos.
@sql8758 2 жыл бұрын
Thank you so much for the video Taufiq. When I'm struggling to SQL problems, your videos are my first to go.
@techTFQ 2 жыл бұрын
I am glad to hear that bro
@towhidulrazu 2 ай бұрын
Your SQL videos are awesome & extraordinarily understoodable. Seems like taking a delicious chocolate everytime. Once again another SQL (recursive this time) is now clear like distilled water! Hats off bro!
@Anonymous_it_is Жыл бұрын
You explain complex topics in a very intuitive manner. Awesome content!! I was having a hard time understanding recursive CTEs, but after watching this - everything seems crystal clear about recursive CTEs :)
@dmitrii4799 2 жыл бұрын
Great explanation. How to show the hierarchy up and additionally if a manager has another employee, besides the searched one, show him and hierarchy down, if searching down found employee has 2nd manager then show him too. So we show all hierarchy of the company.
@tuandino6990 2 жыл бұрын
Finally a video that can help me understand recursive sql query. Salute to you sir
@techTFQ 2 жыл бұрын
Glad this helped
@linear_regression9541 2 жыл бұрын
Man, you are simply brilliant! You were able to make me to understand this (I couldn't even do that at university lol). I just have one suggestion: could you explain not so fast? Thank you so much bro! Greetings from Paraguay!
@techTFQ 2 жыл бұрын
Your welcome buddy.. Glad you liked it and noted on the suggestion 👍
@sujaa1000 7 ай бұрын
Hi @techTFQ, I wanted to express my sincere gratitude for the invaluable knowledge I've gained through your videos. As an experienced data engineer, I have found your content to be exceptionally insightful and well-presented. Your selfless efforts and dedication to teaching have not gone unnoticed, and I truly appreciate the time you invest in sharing your expertise. The clarity with which you explain complex concepts and the practical insights you provide on data analysis have been immensely beneficial to my learning journey. Your commitment to excellence in education is evident, and I wanted to take a moment to acknowledge and thank you for the positive impact you've had on my understanding of the subject. I have enthusiastically recommended your channel to many of my colleagues who, like me, greatly appreciate the quality of your content. Please continue your outstanding work, as it is making a significant difference in the learning experiences of individuals in the data engineering community. Thank you once again for your dedication and exceptional teaching. Regards
@shahid9813 Жыл бұрын
Fantastic in my 10 years of IT i have not seen this in-depth tutorial. Amazing ✋
@fathimafarahna2633 2 жыл бұрын
Simply good 👍 You are helping so many ppl in their journey of learning.. keep it up. God bless✌
@techTFQ 2 жыл бұрын
Thank you 😍
@anushas1910 2 ай бұрын
Your Amazing sir . Even a person with Zero Sql knowledge can easily understand the concept .Thank you for your efforts to make us to understand the concept :-)
@cbarlow3 Жыл бұрын
Excellent explanation, Thofique! I like how when you ran the second example in multiple DBMSs, you went in an order that made you do an ever-increasing number of changes. :) I'll add another layer: if you were using Db2, you would have to 1. remove the RECURSIVE keywork, 2. use UNION ALL instead of UNION (I generally discourage using UNION by itself anyway), 3. specify column aliases as part of your CTE syntax (so far all the same changes you need for Oracle)...AND you also can't do an INNER JOIN in your recursive CTE! Not a problem for Example 1 (output integers 1 through 10), but for Example 2 it means you would have to go back in time to a time before INNER JOIN was invented (pre-1992!) and change your (INNER) JOIN to a Cartesian join (using the old-school comma-separated list of tablenames...not even the CROSS JOIN syntax!) followed by the appropriate WHERE clause to ensure you only get back the same rows that you would have with an INNER JOIN. Weird, right?
@sonalilagnajita8740 Жыл бұрын
Hey @techTFQ, i have been struggling with recursive query from long time. You gave me a crystal clear understanding. Thanks
@fenggao3170 Жыл бұрын
This is definitely an amazing lesson helping me to resolve the issues in my work. Thanks Thoufiq, you are an amazing tutor.
@krishna6296 2 жыл бұрын
Awesome! Thank you and keep posting more SQL tutorials.
@techTFQ 2 жыл бұрын
Your welcome buddy and will do
@pankhudibhonsle5148 Жыл бұрын
Your video was the best resource for learning recursive queries I came across on the internet so far !
@Momo-qr3rd 2 жыл бұрын
Thank you very much🙏😊 It helped me a lot. Watching only one tutorial, made me follow and watch all of your videos. It is a great way to explain complex topics like this with examples. Could you please share your database for each of your tutorials so can pactise with it? Of course I could create it myself but its easier if you would share it.
@techTFQ 2 жыл бұрын
Thank you bro .. glad you liked it.. As for dataset, I always share it either in my blog or in my discord. For this video, you can get it from my discord
@sravangoud9700 2 жыл бұрын
+1
@techTFQ 2 жыл бұрын
Thank you bro
@hiajayy 2 жыл бұрын
Please make videos on procedures and functions. Btw you are doing fabulous job.♥️
@techTFQ 2 жыл бұрын
Thank you Ajay and sure will do
@kinjalbrahmbhatt6410 4 ай бұрын
Hi toufiq, i have been go through many sql videos but your videos are very descriptive i love the way you elaborate small small details while solving queries,it would be great if you help out what is going on in industrial work Love from india
@prajwalsiwakoti9866 2 жыл бұрын
Thank u so much . Could you please make a video on database indexing in detail like what is it, how to do indexing and its usage? Thank you in advance
@techTFQ 2 жыл бұрын
Sure Prajwal , will consider doing it
@muthumariponmurugan7187 2 жыл бұрын
Hi Thoufiq, Thanks for your great job. I got a clear understanding of how to analyze a problem and its implementation. Looking forward to more such videos.Thank you
@techTFQ 2 жыл бұрын
Glad it helped MuthuMari
@odelolatechup1447 2 жыл бұрын
You are great I must be plain...more grace to your elbow... I am your big fan 🤗
@techTFQ 2 жыл бұрын
Thank you so much bro 😀 Appreciate your support
@a-ezzat5677 6 ай бұрын
i really respect you so much you are a professional in my opinion i have learned a lot from you . greetings from egypt
@Rockythepom Жыл бұрын
A detailed explanation of confusing recursive query. simply Awsome
@shuchivardan375 2 жыл бұрын
This is awesome! I have been looking to achieve this in SQL for sometime now. Thanks for sharing!
@zhipengliu4767 4 ай бұрын
Thank you! This tutorial helped me understand recursive sql statement. Thanks very much!
@sreejitchakraborty6575 2 жыл бұрын
Beautiful explanation. The way you explain concepts is crystal clear. Thanks for the amazing videos.
@techTFQ 2 жыл бұрын
Thank you so much ☺️
@siddheshaddarkar4074 3 ай бұрын
Thanks a lot... CTE is great...we can further optimise by creating cte_employee to store employees _details in single time...and use the same cte in recursive
@vamsykamal8932 Жыл бұрын
Ethical Vlogging !! kudos. Disclosing sponsorships @ very beginning. Hard to find such practice these days.
@SwethaNandyala-sf9lt Жыл бұрын
Cant thank you enough for your content and explaination....lots of admiration from banaglore
@ganeshv791 2 жыл бұрын
Awesome got a clear picture on recursion. Please make videos related to dynamic queries in PostgreSQL. One humble request I need clear cut guidance on Service Broker. Thanks....
@techTFQ 2 жыл бұрын
Thank you buddy and noted on the request
@Ismail-hd4yz 4 ай бұрын
Omg i was planning how to manage categories with multi level , and this will perfectly work for me. And most importantly i would able to all parents category and when user click on any of that i can get all which belongs to that specific category. My problem solved
@pradyumnamohapatra2448 Жыл бұрын
so clearly explained Taufiq...your videos really do magic...thank you so much and keep posting such learning videos
@hadibq 2 жыл бұрын
Brilliant Thoufiq! great way of putting things! TY!
@techTFQ 2 жыл бұрын
Glad you enjoyed it Hadi
@rohankhanna8006 2 жыл бұрын
Love the way you explained. Very easy to understand
@techTFQ 2 жыл бұрын
Thank you Rohan 🙏🏼
@Paragkini 2 жыл бұрын
Excellent info... Have always been thinking of handling it through code. Thanks bro.
@techTFQ 2 жыл бұрын
Glad this helped Parag :)
@faizanwar_ Жыл бұрын
Thoufiq Sir , you are best in the business for sure
@techTFQ Жыл бұрын
thanks buddy
@johnsaleem470 Жыл бұрын
Thank you Tafiq for such a wonderful job. You are an excellent teacher, and I have learned SQL from your channel. Keep it up, and be good.
@MichaelJohannessenDK 2 жыл бұрын
Hi Thoufiq, Very interesting subjects you are talking about in the video. One very important think you should consider to extend the video with is indexes when working with recursive functions. My experience tells me that recursive functions often become very inefficient in production-environments because of lack of using necessary indexes, where-clauses and considerations of limiting data for exambly by filtering only necessary data into temp-tables before starting the recursive execution.
@vijaykumar-sy3uu Жыл бұрын
Thanks a Lot Thoufiq for Making great content😀 .Request:: Please make video on UDF
@shafi123 2 жыл бұрын
Thanks Thoufiq for precise and clear explanation
@techTFQ 2 жыл бұрын
Glad this helped Shaik :)
@gaberuth9274 Жыл бұрын
Fantastic Tutorial. Thank you for actually explaining what the code is doing!
@ytef9398 Жыл бұрын
Wooah.. you deserve many subscription. Many thanks, you save my week.. One question, is this work well for a big data row, or better using another method?
@absolutedesi3232 2 жыл бұрын
please make a video on triggers , stored procedures and pragma as well , Thank you.
@techTFQ 2 жыл бұрын
Sure will do
@lambdaboss5528 2 жыл бұрын
Another awesome video. Very well explained and easy to understand. Thanks.
@techTFQ 2 жыл бұрын
Thank you so much ☺️
@kosmipologe Жыл бұрын
Awesome video, very well explained. Thank you. Just one little thing with the last example. I wished you would have changed the level number backwards somehow.
@LiveNobin 2 жыл бұрын
Hi Thoufiq, Thank you for this video.
@techTFQ 2 жыл бұрын
Your welcome buddy
@deepapanneerselvam4618 Жыл бұрын
Mind blowing explanation ..awesome😍😍😍.. Wonderful lectures .. I admired the way to explain the each and evry concepts from scratch to advancced level.
@ashutoshbafna6617 2 жыл бұрын
thank you. you explained beautifully. please give some examples to practice apart from what you have solved - to check learning on these concepts, if possible. thanks a lot .
@techTFQ 2 жыл бұрын
Thank you Ashutosh :) will consider you request.
@nisha6165 2 жыл бұрын
Hi, pls try to post complete vedio on stored procedures and thanks for this vedio
@techTFQ 2 жыл бұрын
Sure Nisha will do it soon
@nisha6165 2 жыл бұрын
@@techTFQ Thanks you🙂
@kaiyao5135 2 жыл бұрын
Thanks so much! very clear and details, love your tutorials!
@techTFQ 2 жыл бұрын
Thank you :)
@suyash7450 Жыл бұрын
Watching your videos makes me Believe that Learning SQL is not that difficult as it seems when we learn from an online course or any other portal, your way of explaining concepts both theoretical and practical is very simple and even a beginner can learn with ease. keep doing the great work.
@ckarkhan 6 ай бұрын
Hi Tofiq...once again you'e. knocked it out of the park! One question on window frames. In some databases, RANGE is not supported at all. Just ROWS is supported. How can we equate the behavior of ROWS to the same as RANGE? Best Regards!
@vikassrivastava7081 2 жыл бұрын
Hi sir , Can we expect a comprehensive tutorial on oracle sql and plsql In near future? Big fan of ur way of explaining these concepts 👍
@techTFQ 2 жыл бұрын
generally I do not want to make a video specific to any RDBMS. Since SQL is an ANSI standard, I prefer to cover SQL concepts which can be applicable to any RDBMS. With this in mind, I may do a complete SQL tutorial in the future. For now, I will be conducting LIVE SQL Course from beginning to advance level starting next month on Lighthall. Will announce it soon on KZfaq and LinkedIn
@techTFQ 2 жыл бұрын
You can find the link in my channel about section
@puneetaggarwal7549 Жыл бұрын
Looking at your queries and way of explanation I wonder why I wasted my money on some SQL course. God why didn't I find your playlist earlier.
@kokarao4874 Ай бұрын
Very detail explanation
@gouravburnwal4883 2 жыл бұрын
Great video on Recusive functions in sql. please make a video on views and indexing.
@techTFQ 2 жыл бұрын
Thank you Gourav 🙏🏼 I have already made a video on VIEWS.. as for index, will do it in the near future
@cgittoes 7 ай бұрын
Great video. Helped made a complex topic easy to understand and follow
@swamivivekananda-cyclonicm8781 Жыл бұрын
Fanstastic explanation. You have gift of explaining concepts.
@ririraman7 2 жыл бұрын
Make a video on CROSSTAB in postgresql...or pivot in sql
@techTFQ 2 жыл бұрын
Sure will do
@ririraman7 2 жыл бұрын
@@techTFQ Thank you veere. You came as angel in our lives. SQL💪
@vasireddyvishnu8012 2 жыл бұрын
Your videos are great . Please do videos on pl/sql also
@techTFQ 2 жыл бұрын
Thank you bro and sure will do
@raghud541 2 жыл бұрын
Thanks a lot for this wonderful explanation.
@techTFQ 2 жыл бұрын
Your welcome 🙏🏼
@vishalkarur5366 2 жыл бұрын
Hi Thoufiq, As usual excellent video . Can you also please make a video on how to get started with portfolio website creation . Thanks Vishal
@techTFQ 2 жыл бұрын
Thanks Vishal and sure will do it!
@shaikhanuman8012 Жыл бұрын
Tq for sharing valuable information, sir.
@cooldwnload 2 жыл бұрын
Great work to bring in all concepts 👍
@techTFQ 2 жыл бұрын
Thanks a lot 😊
@jaewonyang Жыл бұрын
Excellent explanation! Thank you very much.
@kancharalaparameshwarreddy3837 2 жыл бұрын
excellent video sir
@techTFQ 2 жыл бұрын
Many many thanks bro
@callravik 2 жыл бұрын
Let us see 1st problem. For the 1st iteration, we know there is 1 row , so for the 2nd iteration, it would be n + 1 = 1 + 1 = 2. Now for the 3rd iteration, we have row 1 and row 2, would n + 1 operates only on the latest row which is 2, and ignores the 1st row? Or else for each execution all the rows would be incremented by 1 which is wrong.
@maximilianjaeger8545 Жыл бұрын
10 out of 10 Video🤝
@QelDoQ Жыл бұрын
Thank you! This explained things so clearly.
@majidnabavi9900 Жыл бұрын
Best explanation , thank you ;)
@spandanalakkakula6706 2 жыл бұрын
Good work.. Thank you for all the videos you upload. Can you make a video on the "find interview candidates leetcode (1811)" problem.
@techTFQ 2 жыл бұрын
Noted, will consider it
@ambikabahuguna7908 2 жыл бұрын
great explanation
@techTFQ 2 жыл бұрын
Thank you :)
@jaydeeppatidar4189 2 жыл бұрын
Very well explained! Thank you!
@techTFQ 2 жыл бұрын
Glad it was helpful!
@AsadAli-wi1xs 2 жыл бұрын
Supereb content 👌👌👌
@techTFQ 2 жыл бұрын
Thank you 🙏🏼
@sampadsaha1449 2 жыл бұрын
Hi, your explanations are really very helpful. can you please make a video on dynamic sql ?
@techTFQ 2 жыл бұрын
Thank you and will consider it
@jullienbeaufondcamacho2055 9 ай бұрын
Superb explanation! 👏
@techTFQ 8 ай бұрын
Thank you 🙂
@sadafshahbaz2488 Жыл бұрын
wonderful explanation.
@satheeshkumarak6708 2 жыл бұрын
Such a Masterpiece!!!
@techTFQ 2 жыл бұрын
Thank you bro
@ismailrana Жыл бұрын
Excellent, I really love your all videos.
@oscarcisnerosruvalcaba3894 Жыл бұрын
Hello hello , amazing videos . You should show more unknlw functions such as : Quality , using , natural joins and so on . It Will be great !!
@youssefjemal2433 9 ай бұрын
This video helped me a lot, Thanks !
@techTFQ 8 ай бұрын
You're welcome
@davidhickman4976 2 жыл бұрын
Very useful video. Thank you!
@techTFQ 2 жыл бұрын
Glad it helped
@tyl9680 2 жыл бұрын
Which method is more efficient? (1) Recursive or (2) declare a temp table and use while loop to add the result to the temp table?
@naveenkumark6093 Жыл бұрын
Hi Toffiq, Really thank you for the great concept... I have one doubt..,(question-01) 1st iteration : n=1 2nd iteration: select 2 from t where 2
@readerssquare2660 2 жыл бұрын
Thank you somuch Can you do a video about stored procedures ?
@techTFQ 2 жыл бұрын
Will definitely do very soon
techTFQ
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