Understanding and Using APPLY (Part 2)

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Understanding and Using APPLY (Part 2)

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Paul White

Posted Saturday, April 17, 2010 11:16 AM

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Comments posted to this topic are about the item Understanding and Using APPLY (Part 2)

Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi

Post #905448

Paul White

Posted Sunday, April 18, 2010 3:36 AM

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I would like to express my sincere thanks to the following people, for their help in producing this article:

Amanda Lawrence
Jeff Moden MVP
Chris Morris
Lutz Müller
Jason Brimhall

Paul

Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi

Post #905547

peter-757102

Posted Monday, April 19, 2010 4:27 AM

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Excellent and with enough extra material to make it interesting for those already familiar with apply!

Post #905819

clementhuge

Posted Monday, April 19, 2010 4:43 AM

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Very interesting. I alrady use cross apply (mostly with table-valued functions) and I use a lot of xqueries. I like the last t-sql code about xquery. I was not using aliases and also navigating with rowset and the apply functions. Good tip!

Clement

Post #905822

Mike M - DBA2B

Posted Monday, April 19, 2010 6:19 AM

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Thank you once again, Paul. I'll be experimenting today.

I just noticed something that I think is in error:

The first CROSS JOIN example under your "Equivalent Expressions Using APPLY and JOIN" header performs "ORDER BY S.name ASC, S.name ASC". Is that supposed to be "S.name ASC, J.name ASC"?

Regards,

Mike M

Post #905890

greenclay

Posted Monday, April 19, 2010 6:19 AM

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Thanks for this article. There's a lot to consider here.
In the CROSS JOIN section, the query

SELECT S.name, J.name
FROM dbo.Student S
CROSS
JOIN dbo.Subject J
ORDER BY S.name ASC, S.name ASC;

should read

SELECT S.name, J.name
FROM dbo.Student S
CROSS
JOIN dbo.Subject J
ORDER BY S.name ASC, J.name ASC;

should it not?

Post #905891

Daniel Bowlin

Posted Monday, April 19, 2010 7:21 AM

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A thorough and well explained article. The supplemental file was a real bonus. Thanks.

Post #905955

WayneS

Posted Monday, April 19, 2010 8:31 AM

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Paul - another excellent article on using APPLY. Thank you so much for doing this... now I need to find the time to disect these two articles, and get a good understanding of them.

Again, thanks for doing these.

Wayne
Microsoft Certified Master: SQL Server 2008

If you can't explain to another person how the code that you're copying from the internet works, then DON'T USE IT on a production system! After all, you will be the one supporting it!

Links: For better assistance in answering your questions, How to ask a question, Performance Problems, Common date/time routines,
CROSS-TABS and PIVOT tables Part 1 & Part 2, Using APPLY Part 1 & Part 2, Splitting Delimited Strings

Post #906030

Trey Staker

Posted Monday, April 19, 2010 9:00 AM

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Very well written article. Thanks Paul.

---------------------------------------------------------------------
Use Full Links:
KB Article from Microsoft on how to ask a question on a Forum

Post #906061

Tom Garth

Posted Monday, April 19, 2010 9:37 AM

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I will be using APPLY beginning this week. Thanks for a really understandable series.

Tom Garth
Vertical Solutions

"There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves." -- Will Rogers

Post #906095

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