Part 3 How does a recursive CTE work

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A lot of you have asked to explain, how a recursive CTE work line by line. If you have not watched Part 2 already, I strongly recommend to watch that video first before proceeding.
In Part 2 of SQL Server Interview questions and answers video series we discussed recursive CTE to retrieve the organization hierarchy.
Let's now discuss how the CTE executes line by line.
Step 1: Execute the anchor part and get result R0
Step 2: Execute the recursive member using R0 as input and generate result R1
Step 3: Execute the recursive member using R1 as input and generate result R2
Step 4: Recursion goes on until the recursive member output becomes NULL
Step 5: Finally apply UNION ALL on all the results to produce the final output

[@baldytechie7741]

Hi Venkat,
This is the best explanation that I came across about Recursive CTE. It will be a UNDERSTATEMENT to say "your tutorials are awesome or helpful" but rather I would say what ever I know of SQL server today is only because of your tutorials.
I really owe a lot to you.
Regards,
Ayan

[@Csharp-video-tutorialsBlogspot]

+Ayan Putatunda Thanks a million for taking time to give feedback. I am glad you found the videos useful.
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[@rajeevvenkata2295]

Cant believe that you gave this wonderful explanation before 6 years (2020 currently). The best youtube video I've ever seen.

[@Divinewind42]

This was the most comprehensive explanation i've seen on this subject. You're the boss of bosses!

[@duytdl]

I love your videos. I've been getting into SQL and every time I search something complex (like this--recursive queries) I always find your video among the top and it easily stands out. Your videos have stood the test of time (I'm finding them helpful in 2020). Also your voice is amazing - calm and gentle. Awesome work!

[@vikashvishwanathan7814]

This is exactly what I wanted to know when I watched the previous video and I was really happy when I just jumped into this video !!

[@israilkarud9293]

Tried many tutorials but this one is gem. God bless you Venkat. I have no words to admire you :)

[@isasharifov1850]

Hi Venkat, one word I can say about you, you are amazing man! Please dont stop SQL SERVER video tutorials

[@abhjitde]

simply superb, i learnt sql in jus 2days...hatsoff bro..keep up the good work

[@UmeshKumar-ox3zp]

Dear Venkat, You are the best tutor ever exist on this planet!!

[@Luke-bl2qk]

I had a few questions after watching your video: Recursive CTE in SQL Server part 51, but this made the concepts easier to understand. Thank you for the great videos, Venkat!

[@wkartchner]

I wish I had seen this tutorial before my last interview.
Thank you.

[@emilyyang3478]

Thank you so much for all your tutorials, the most helpful I've ever seen and awesome for understanding! Looking forward to more series such as spark, ETL etc...

[@66sandeep66]

Absolutely crisp and clear! Kudos, Venkat!

[@sabaamanollahi5901]

when I first saw the video I had doubts to watch it, because I thought it is like other videos and don't have a deep explanation of how recursive works, but after watching I saw the differences and how clearly you explained this complex subject. THANKS VERY MUCH

[@zizu7755]

Absolutely wonderful explanation, Venkat. Even after 9 years there is nothing similar I found related to recursive CTE content.

[@biswajitpradhan6121]

The way you describes is just best . And you are Doing all the things for free . Thank you for all these Sir . 🙂

[@SriRam-bx7hc]

I searched for this topic one hour all tutorials are just hard to understand but yours make it easy ...
Thanks...

[@snackymcgoo1539]

Anchor and recursive member... perfect, thanks for the walk through. Excellent line by line example.

[@dhratiacharya3676]

Your way of explaining is amazing. Please keep posting all the SQL interview Q&A.

[@emilyf2641]

Hi Venkat,
Love your explanation of recursive CTE, wonderful! LOVE IT!

[@akkiyethi]

Hi Venkat Sir,
You are doing a great Job by helping us all learn the complex concepts in a very simple manner.
I don't Google for oracle/SQL server concepts, I directly come to your youtube channel.
Thanks a ton :)
Very very helpful videos.

[@azfar19]

Hi Venkat,
Thank you for preparing these tutorials and videos. They have been very helpful in improving my understanding of the concepts. Concise and to the point with perfect explanation.

[@krismaly6300]

Crystal clear explanation. Appreciate all your efforts in educating the community.

[@paulmealing2977]

I'm finally understanding recursive ctes. Thank you.

[@giovanni-cx5fb]

This video is a treasure. It was massively helpful, thank you.

[@alejoes]

By FAR the best explanation I have seen about a topic. Thank you sr.

[@richhertz6086]

Best recursive CTE explanation ever! Thanks!

[@karthikvyas8629]

Thank you very much Venkat , one of your best video, very complicated concept explained in a very understandable way .

[@Tall-Cool-Drink]

I love your videos. They are the best on the internet.

[@riyankabhowmick697]

Truelly... I must say i became fan of yours and your tutorial.. To be very honest first time i understand preperlly this recursive CTE... 1000 Thumbs uppppp for this vedio from my side...

[@alberthsu951]

Really detailed and amazing explanation. Thank you so much for the tutorials!!

[@anindyabose5988]

You are the best Venkat. Thanks

[@suganyasmk92]

Wow... This s useful video.. U r explaining clearly.. Still no one can do explain like you... Thank you so much of your explanation.. Now I clear abt the cute functionality

[@ManishPatel-rs6dm]

The best explanation on Recursive CTE, step by step !!

[@manuelgmra]

A simple way to explain a complex feature.
Thanks a lot

[@Eisenhiem24]

Absolutely brilliant!!!!!! Thanks a million

[@surnameh7227]

What a good job explaining this! Thanks so much!

[@furkotikoo4216]

thaaaaannnnkkk youuuuuu very much.. The way of your explanation with your soft voice is perfect...

[@johnnguyen1655]

Yes finally I got recursion in sql. thanks!

[@dineshtulasiram4987]

Many thanks venkat ....awesome tutorials...

[@djnature1741]

Best explanation. Great Job and Thank you Venkat.

[@ishamadaan3748]

Thank you so much for posting this video, it was very helpfull :)

[@ashishmukarne4917]

short and clear explanation on recursive CTE execution,
Thank you..

[@laxmisagar8189]

Sooooperb explanation..... watching part2 and even all the pre-requisites of part2 of this lecture series i was confused how does a recursive CTE work but after watching this part3 am crystal clear with this concept thank you so much sir..:)

[@mrajeshrk]

Thank you Venkat. Very helpful.

[@damiancollier5051]

well done again Venkat, very clear

[@yisauramon5775]

Thanks for the video Venkat, kindly upload video on Application Deployment and FileSystemWatcher Class.God bless you.

[@RC-nn1ld]

Fantastic explanation, I now finally understand it!

[@babencherian278]

very nice explanation and would love your videos. Thanks Venkat

[@orxanbabashov]

Thanks a million..You are the best tutor !!!!

[@relook5366]

Crystal clear! Thank you!

[@ramachandransathishkumar6614]

Great Work Venkat

[@luismanueldiazbaron9588]

This explanation is perfect. Thanks!!!

[@MalayKhandkar]

wow this was super helpful!! Thanks a lot for explaining this in such simple way

[@WaynezWorldz]

Excellent! A very good explanation of recursive CTE's!

[@PraBi12]

Your videos are gems.

[@cleversachin]

Kudos, one of the best in youtube

[@frankietao1418]

Very good explanation. Thanks!

[@mr.prasadyadav]

Nice tutorial , Thank you Mr.Kudvenkat ❤️

[@devarakondasankararao3802]

Hi Venkat, good video to understand recursive cte ,thanks a lot for this

[@devarakondasankararao3802]

Nice Explanation ,Thank You Venkat Sir

[@Deepakkumar431]

Awesome.Thanks a lot for the great explanation.

[@victortheimmoral]

I find your videos very helpful

[@lukasavic18]

absolutelly best explanation ever

[@Persianchannel1]

exceptional definitive explain, thank you

[@lI1I1ll]

excellent explanation!

[@fy687]

The best CTE explanation

[@tejaswininandam6359]

Thanks for the great explanation. This is best ever.....

[@desibiden3860]

Thx, now I understand how recursive cte works.

[@HomerBartStewie]

Great explanation. Thank you!

[@huiqingxu5286]

Thank you! You are amazing!

[@shahrozetariq3764]

Sir you are the best!

[@gokulsukumar1699]

Excellent. Thank you sir.

[@naveenreddy6023]

Saying simple thanks is not enough for you, i am Nil in sql before watching this Pragim technologies SQL videos, now m almost clear sql.

[@nuthouse99]

Outstanding. Thank you.

[@sellamuthusrinivasan4370]

Thanks a lot for your tutorials..

[@nehat1874]

Hello Venkat,
I have learned a lot and in a much simpler way from your tutorials. I want to request you to help me understand how the levels are assigned to the hierarchy. Thank you :)

[@avadhoot1100]

thanks you are the Best person ..........

[@jnubbz36]

Beautiful explanation!

[@girijesh-mca]

thanks sir..this is very helpful tutorial......

[@user-dn8lr8ye8k]

Best explanation. Thanks.

[@yugeshkekre]

Wonderful explanation for a concept which is not intuitive at all. Thanks a lot

[@dhavalprajapati21]

Hi Venkat, thank you for making such easy to understand videos.
Could you please make one video on recursive CTE to handle the case when employeeID and ManagerID are same?

[@khushboogupta4909]

Nicely explained , thanks n good job 👍

[@THIENDAYNEHIHI]

a nice explanation ! thank you, i'm from Viet Nam

[@Adinasa2]

Great Explanation!

[@sbmqureshi77]

thanks for clearing my concepts

[@ami4098]

Thanks for the great explanation

[@gme0ver24]

Super useful, thanks!

[@ayoob999]

Thank You Sir..Appreciate

[@saagarsoni3]

thnx a lot venkat sir

[@user-gp5hp2rq2y]

brilliant explanation!

[@daryamomeni9613]

Excellent. Thank you so much

[@RC-nn1ld]

Best example on the net thanks

[@prajwalsiwakoti9866]

Excellent work Sir🙏

[@mahipalkamanchi]

thanks you sir pl upload following concepts
what covariance vs contravariance in C#
How to Debug DLL C#
Paging in SQL

[@skabdulrahim4318]

Sir Best explanation Recursive CTE. Best video (y).

[@rahmanfetrat2832]

that explanation was excellent
thank you sir

[@coding7241]

sir thankyou so much ..........for the explanation

[@afijovial6373]

awesome explanation..Thanks :)