SQL | Recursive CTE | Practical Examples and 5 Use Cases | Sequences | Hierarchies

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In this tutorial, we understand the concept of SQL Recursive CTEs and explore its multiple use cases.
Examples in this tutorial -
1) Sequence of Numbers
2) Sequence of Dates
3) Sequence of Alphabets
4) Extracting each character of a string
5) Bill of Material Hierarchy

The Employee Manager Hierarchy tutorial can be found here -

Other examples of Recursive CTEs
How to generate date records for a Calendar table?

How to generate missing date records?

How to extract Odd/Even numbered characters?

All SQL statements related to this video tutorial can be found here-

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LearnatKnowstar

Very helpful! Thank you for breaking it down. This was exactly what I needed to understand CTEs. :)

DanPrince

very clearly explained and excellent examples. Looking forward to more detailed videos like this 👍

kristyowens

Great video! Exactly what I was looking for to refresh myself on recursive ctes. Your videos are always helpful. 🤗

MethodOverRide

Great topic. Superb explanation. You deserve more subscribers !

hv

Brilliant! Best video on this subject!

TomaszBI

At 13:04 stream time, Please let me know why output has "Z" included when we already mentioned ""< ''Z" " (should this not exclude "Z")?

mangesh

So, it's basically a while loop but in SQL format. I've been wanting to find out how to do for loop or while loop in SQL for a very long time! Thanks!

JulieWork

This is an excellent way to generate date range, however, I don't know if it would work in PostgreSQL/MySQL. A question was asked to me during an interview where the Recursive CTE was to be used. The question was to find the number of Sundays in the month of August 21. I didn't know how to approach it then, but Recursive CTE along with DATENAME function would have done the job.

riddlex

This tutorial is amazing! For example, with the auto calendar, given that there's the DECLARE statement at the beginning, is there a way to turn this into a View so it can simply be run when needed? Or, must it be a Stored Proc? Thanks.

JulieWork

Hi Ma'am
By using of this cte .
I need rows starts like this type so how to do it..
001, 002, 003, ...010, 011, 012, 013, ..., 100

bprasad

Great explanation, can you please give information regarding semicolon in CTE

dasarivenkatachalapathi

hello there, god bless your efforts..I have a simple enquiry as new sql learner.
How are CTEs different from temporary tables?
Thanks for taking care of this.

hasanmougharbel

I have a usecase as below
There are n number of nodes connected to each other,
Every output link of a node matches with the input link of another node
I have to make them join based on inputlinkid and outputlinkid

But the challenge here is I don't know how many nodes a flow has, so I have to create columns dynamically where each column represents a node name.

Can you please help me how to create dynamic columns while running recursive cte

mankala

Please make a video two parts 12 minutes

darbardarbar

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