Calculating interest query

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Calculating interest query

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Ninja's_RGR'us SSC Guru Points: 294069 More actions · Answer 1

Chris Morris-439714 (11/1/2010)
Paul White NZ (11/1/2010)
Chris Morris-439714 (11/1/2010)
Nah mate my walking-on-water skills are still underwhelming - don't even drink the stuff, fish f...never mind. Spill the beans! I'll try to understand, promise!
SQLCLR, naturally - using Adam's Query Parallelizer 🙂
Ooh you cheat, that's not a fix that's a different method altogether 😉

How's that cheating?

You never rewrote something from scratch to make it more efficient?

ChrisM@Work SSC Guru Points: 186127 More actions · Answer 2

Ninja's_RGR'us (11/1/2010)
Chris Morris-439714 (11/1/2010)
Paul White NZ (11/1/2010)
Chris Morris-439714 (11/1/2010)
Nah mate my walking-on-water skills are still underwhelming - don't even drink the stuff, fish f...never mind. Spill the beans! I'll try to understand, promise!
SQLCLR, naturally - using Adam's Query Parallelizer 🙂
Ooh you cheat, that's not a fix that's a different method altogether 😉
How's that cheating?
You never rewrote something from scratch to make it more efficient?

Y.

^{“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw}

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden

Paul White SSC Guru Points: 150467 More actions · Answer 3

Chris Morris-439714 (11/1/2010)
Y.

That's a pretty efficient answer right there!

Paul White
SQLPerformance.com
SQLkiwi blog
@SQL_Kiwi

Ninja's_RGR'us SSC Guru Points: 294069 More actions · Answer 4

Y

Would have been much better, 50% space saved in the DB, and then remove the signature and you're off to the races! :w00t:

Jeff Moden SSC Guru Points: 1003873 More actions · Answer 5

Sorry... posted to the wrong thread... post removed.

--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.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)

chauhanparixit SSC-Addicted Points: 429 More actions · Answer 6

Dear SQL Kiwi,

Could you please explain little bit of your code, i mean what is happning behiend the scene (I am little week in T-SQL).

Nice code by the way!!

Thanks in advance

piyush.varma Valued Member Points: 70 More actions · Answer 7

Re: Super Fast DISTINCT using CTEs - by Paul White

Hi Paul,

How can I extend your technique to multiple VARCHAR columns please?

Any clues please?

Thank you,

Piyush

Jeff Moden SSC Guru Points: 1003873 More actions · Answer 8

piyush.varma (7/23/2012)
Re: Super Fast DISTINCT using CTEs - by Paul White
Hi Paul,
How can I extend the technique to multiple columns please?
Any clues please?
Thank you,
Piyush

It IS VERY fast indeed! But only if the number of distinct rows out number those that have duplicates. If you have a lot of duplicate rows, you may want to revert back to a simple DISTINCT or GROUP BY clause.

--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.

Change is inevitable... Change for the better is not.

Helpful Links:
How to post code problems
How to Post Performance Problems
Create a Tally Function (fnTally)