Recursive CTE in sql server Part 51

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In this video we will learn about recursive common table expressions and the problems they solve. A CTE that references itself is called as recursive CTE.

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Csharp-video-tutorialsBlogspot

oh great and mighty Kudvenkat, we eternally thank you for sharing another piece of your infinite wisdom

kzev

It took me a minute to realize it but it's a lot simpler than it looks, getting into recursion theory will over complicate it. You're simply starting off with the big boss in the EmployeesCTE, then using his employeeid to match who has the same managerid in the employee table, that returns Mike and Tom and you increment the Level by 1. You now repeat the same process with Mike and Tom's employeeid

temprmj

THANK you for creating technical videos that do not move at a snail's pace. This must be the first technical video where I didn't have to put the video speed at 1.75 - 2x. Well done.

michaelgerety

One & only best video on recursive CTE's. Venkat ji, you rock!

sachin_yt

This is a great attempt to explain Recursive CTE's, but the self-join and heirarchy complicates things for the beginner. For those who are still confused, the 'Essential SQL' channel has a really simple breakdown...

The-Right-is-Right

My two cents for recursion, Step1 Super Boss is Add to EmployeeCTE, Step 2 TblEmployee with only Employee who had Super Boss as direct Manager are add to table with level 2 now Employee CTE has level 1 and 2, so recursively level 3, 4, .. will be added because there respective manager become available to them in EnployeeCTE

omaraissa

There could be no clear explanation than this, Keep making videos😉

Sunny-okdl

Your videos are so much helpful for us to learn🙏

nammozhi

why dislike? he is one of the best teachers

shabbarrizvi

Superb ! very well explained on recursive CTEs.

reddyabhik

recursive cte query is still unclear, how would it loop through, initially the cte will have one record that is the employee with level1 and then we are applying join on cte that has 1 record with table that has all the records, could you explain it to me please

LokeshSharma-wpxv

Thank you very much , you are the best learning for all technology. . go forward .

omymma

Thanks Venkat great videos because of these videos I learn

krishnanomula

Hi Mr.venkat your explanation is superb and thanks for sharing your knowledge.

roseroja

Honestly I feel the recursion part of this video is under-explained while he spent time more time on explaining simple operations which is more convenient to explain.

YT-yt-yt-

Thanks a lot! very good tutorials, useful and easy to understand

iirs

Hi Venkat,
Your Tutorials are awesome thanks for making these.
I think there is no need of last Join in the Query.Please look into Below Recursive CTE Query

With T1
As
(
Select EID,
Name,
MID,
cast('Super Boss' As varchar(50)) As Manager_Name, -- I am casting it to varchar(50) Because 'Name' Column in EMP table is varchar(50)
1 As Level
From Emp
Where MID is NULL

Union ALL

Select E.EID,
E.Name,
B.EID As MID,
B.Name As Manager_Name,
B.Level+1 as Level
From Emp E
inner join T1 B
On E.MID=B.EID
)
Select Name,
Manager_Name,
Level
From T1;

rahulphutela

Hi Sir, Happy teachers day....Can you please cover the recursive query part in more details...explaining the flow of the recursive query..thanks in advance

itsivanshi

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