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Statement evaluation precedence
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Statement evaluation precedence
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Tom Brown
Tom Brown
Posted Thursday, May 06, 2010 8:16 PM
Ten Centuries
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Comments posted to this topic are about the item
Statement evaluation precedence
Post #917566
Oleg Netchaev
Oleg Netchaev
Posted Thursday, May 06, 2010 8:27 PM
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This is a very good question, thank you Tom. Today I am the lucky one to be first who answered it correctly. It was not too difficult to deduce correct answer because it was the only one noticeably making perfect sense. The Logical Query Processing Diagram is great, I will definitely print it out and have it posted on the wall by my desk.
Oleg
Post #917569
Paul White
Paul White
Posted Thursday, May 06, 2010 10:37 PM
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Yay! Another point. Found this one quite easy - but only because I happened to re-read Itzik Ben-Gan's Inside Microsoft SQL Server 2008: T-SQL Querying recently. (Chapter 1)
Itzik describes the
logical
order of processing as:
FROM
Cartesian Product
ON clause filter
Add Outer Rows
WHERE
GROUP BY
HAVING
SELECT
Evaluate expressions
DISTINCT
TOP
Presentation ORDER BY
I would just add that the physical order of operations performed may differ from the logical order due to query optimisation.
Well done Tom.
edit: added further details after re-reading the question explanation
Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi
Post #917600
SQLRNNR
SQLRNNR
Posted Thursday, May 06, 2010 11:33 PM
SSCoach
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woot - got it correct.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #917621
SQLRNNR
SQLRNNR
Posted Thursday, May 06, 2010 11:38 PM
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Though I got this correct, it appears there is a typo in the correct answer. My version had the last two flip-flopped based on the source document provided in the answer.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Posting Data Etiquette - Jeff Moden
Hidden RBAR - Jeff Moden
VLFs and the Tran Log - Kimberly Tripp
Post #917629
Paul White
Paul White
Posted Friday, May 07, 2010 12:17 AM
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CirquedeSQLeil (5/6/2010)
Though I got this correct, it appears there is a typo in the correct answer. My version had the last two flip-flopped based on the source document provided in the answer.
What are you referring to here Jason?
It must be hard to spot - I can't see anything wrong...
Paul White
SQL Server MVP
SQLblog.com
@SQL_Kiwi
Post #917651
sharath.chalamgari
sharath.chalamgari
Posted Friday, May 07, 2010 12:25 AM
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Good Question Tom
Post #917654
Tom Brown
Tom Brown
Posted Friday, May 07, 2010 2:11 AM
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Thank-you all.
I've had this data for 10 years now, maybe I copied it from someone's SQL 2000 book - or possibly it came from an SQL 7 course I did (in 1999!), and I found it really useful, But I was slightly unsure that it was still valid, particularly as I had some difficulty in finding a concrete reference.
Thanks Paul for the tip on Itzik's book - I'll be visiting Amazon soon I think (or should I wait for the R2 edition?)
Post #917701
ziangij
ziangij
Posted Friday, May 07, 2010 2:12 AM
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got to learn something new today... thanks
Post #917702
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Friday, May 07, 2010 2:14 AM
Hall of Fame
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Last Login: Yesterday @ 8:31 AM
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Had to wrack the grey matter on this one - haven't thought about it for several years...
good question.
____________________________________________
Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #917703
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