SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


CTE


Author
Message
vignesh.ms
vignesh.ms
SSC Eights!
SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)

Group: General Forum Members
Points: 848 Visits: 516
How do I nested common table expression?
Eugene Elutin
Eugene Elutin
SSChampion
SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)SSChampion (13K reputation)

Group: General Forum Members
Points: 13018 Visits: 5478
vignesh.ms (8/1/2013)
How do I nested common table expression?


To nest CTE just use comma:

;WITH cte1 AS (SELECT .... FROM [sometable])
,cte2 AS (SELECT .... FROM cte1 or/and [sometable] )
,cte3 AS (SELECT .... FROM cte2 or/and cte1 and [sometable] )


Or your question is really about recursive CTEs?

_____________________________________________
"The only true wisdom is in knowing you know nothing"
"O skol'ko nam otkrytiy chudnyh prevnosit microsofta duh!":-D
(So many miracle inventions provided by MS to us...)

How to post your question to get the best and quick help
vignesh.ms
vignesh.ms
SSC Eights!
SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)SSC Eights! (848 reputation)

Group: General Forum Members
Points: 848 Visits: 516
yes...
happycat59
happycat59
SSCrazy Eights
SSCrazy Eights (8.9K reputation)SSCrazy Eights (8.9K reputation)SSCrazy Eights (8.9K reputation)SSCrazy Eights (8.9K reputation)SSCrazy Eights (8.9K reputation)SSCrazy Eights (8.9K reputation)SSCrazy Eights (8.9K reputation)SSCrazy Eights (8.9K reputation)

Group: General Forum Members
Points: 8935 Visits: 3281
Have a look at this TechNet article... http://technet.microsoft.com/en-us/library/ms186243(v=sql.105).aspx

It shows sample data and the results of a recursive CTE (I think that this is what you are after)



dwain.c
dwain.c
SSCoach
SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)SSCoach (18K reputation)

Group: General Forum Members
Points: 18451 Visits: 6431
You may want to also look at the third link in my signature for some other examples of using recursive CTEs.


My mantra: No loops! No CURSORs! No RBAR! Hoo-uh!

My thought question: Have you ever been told that your query runs too fast?

My advice:
INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.


Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
Since random numbers are too important to be left to chance, let's generate some!
Learn to understand recursive CTEs by example.
Splitting strings based on patterns can be fast!
My temporal SQL musings: Calendar Tables, an Easter SQL, Time Slots and Self-maintaining, Contiguous Effective Dates in Temporal Tables
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum

































































































































































SQLServerCentral


Search