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Group Islands of Contiguous Dates (SQL Spackle)


Group Islands of Contiguous Dates (SQL Spackle)

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Jeff Moden
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Sorry for the late reply, Dwain. Thanks for the research and the confirmation.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

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Very nice, thanks for the article. CTE's can be really confusing.
Jeff Moden
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Thank you for the feedback, Nelson, and welcome aboard!

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
ALZDBA
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how a simply clever trick just blows your mind.

I wonder how many people only read this Spackle once and really got it.

I just copied it to ssms and walked it through reading it, sat back and sipped my tea ( as if I were Sherlok Holmes handling a one pipe problem ) .

Not the first time Jeff succeeds in astonishing me with a simple solution for a quite commom problem.

Thanks again for sharing it all, Jeff

Johan


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Igor Micev
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Nice article!
I immediately applied the code (with minor changes) on another database, and it worked!

Thanks Jeff.

Regards,
IgorMi


Igor Micev,
‌SQL Server developer at Seavus
www.seavus.com
Jeff Moden
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Thanks for the feedback, Johan. It's always a pleasure to hear from you.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
Jeff Moden
Jeff Moden
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IgorMi (10/4/2013)
Nice article!
I immediately applied the code (with minor changes) on another database, and it worked!

Thanks Jeff.

Regards,
IgorMi


Very cool! Thanks for the feedback. I love success stories.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
dwain.c
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I skimmed the article but I couldn't really identify what's new in this re-publish.

I don't suppose you could give us a quick synopsis Jeff?


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
Jeff Moden
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dwain.c (10/6/2013)
I skimmed the article but I couldn't really identify what's new in this re-publish.

I don't suppose you could give us a quick synopsis Jeff?


Apologies for the VERY late reply, Dwain. No doubt that by now you've figured out that SQL Server Central frequently republishes articles that have had no changes at all. To wit, most articles that show up on Fridays were previously published.

--Jeff Moden

RBAR is pronounced ree-bar and is a Modenism for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
Stop thinking about what you want to do to a row... think, instead, of what you want to do to a column.
Although they tell us that they want it real bad, our primary goal is to ensure that we dont actually give it to them that way.
Although change is inevitable, change for the better is not.
Just because you can do something in PowerShell, doesnt mean you should. Wink

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
dwain.c
dwain.c
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Jeff Moden (6/28/2014)
dwain.c (10/6/2013)
I skimmed the article but I couldn't really identify what's new in this re-publish.

I don't suppose you could give us a quick synopsis Jeff?


Apologies for the VERY late reply, Dwain. No doubt that by now you've figured out that SQL Server Central frequently republishes articles that have had no changes at all. To wit, most articles that show up on Fridays were previously published.


Better late than never.

Had that happen to one of mine, so I know the drill.


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


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