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PRINT vagaries
50 posts, Page 5 of 5
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Christian Buettner-167247
Christian Buettner-167247
Posted Thursday, July 01, 2010 2:32 AM
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Hi Openminded,
I am not sure what your question is. But here is a transformation of the selects you gave which might be helpful to you.
Just remember that the unary plus (+) or minus (-) have a higher precedence than multiplication or division, which in turn also have a higher precedence than addition or substration.
Finally the calculation is executed from left to right (if not overridden by the precedence of operators or parentheses):
select 1 - 2
This is a simple substraction
select 1 + 1 * 2
This translates to 1 + (1 * 2)
select 1 +-+ 1 * 2
This translates to (1 + ((-(+1)) * 2))
select 1 +0+ 1 * 2
This translates to ((1 + 0) + (1 * 2))
select 1 ++ 1 * 2
This translates to (1 + ((+1) * 2))
Best Regards,
Chris Büttner
Post #945998
Open Minded
Open Minded
Posted Thursday, July 01, 2010 3:16 AM
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@christian That was perfect. Thanks.
Post #946010
krishnaroopa
krishnaroopa
Posted Thursday, July 01, 2010 10:27 PM
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Thanks.. Now I understand.
I was wondering what happened to '-'
Also, why not it work like this:
'-' being string,
other two can implicitly convert to string?
Post #946578
Christian Buettner-167247
Christian Buettner-167247
Posted Friday, July 02, 2010 12:42 AM
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You are welcome, Open Minded
Best Regards,
Chris Büttner
Post #946607
Hugo Kornelis
Hugo Kornelis
Posted Friday, July 02, 2010 1:57 AM
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krishnaroopa (7/1/2010)
Also, why not it work like this:
'-' being string,
other two can implicitly convert to string?
They can, but they won't. SQL Server uses well-defined rules for data type precedence for implicit conversions. Lower predence data types will always convert to higher precedence data types; never the other way around.
These rules are documented in Books Online. Use the index to find "data types [SQL Server]], precedence". Or read through the discussion, I believe I posted a link to this subject in the online version of BOL on one of the first pages.
Hugo Kornelis, SQL Server MVP
Visit my SQL Server blog:
http://sqlblog.com/blogs/hugo_kornelis
Post #946632
SQLRNNR
SQLRNNR
Posted Wednesday, July 07, 2010 2:59 PM
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Nice question - thx
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 #948861
The Dixie Flatline
The Dixie Flatline
Posted Thursday, July 08, 2010 10:08 PM
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edited: never mind
__________________________________________________
Against stupidity the gods themselves contend in vain.
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Stop, children, what's that sound?
-- Stephen Stills
Post #949712
L' Eomot Inversé
L' Eomot Inversé
Posted Friday, July 09, 2010 7:25 AM
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Definitely a fun question - and interesting discussion. But, as Christian pointed out, "Print vagaries" is not the right title for this.
Tom
Que conclure à la fin de tous mes longs propos? C'est que les préjugés sont la raison des sots. (Voltaire, 1756)
Post #949947
L' Eomot Inversé
L' Eomot Inversé
Posted Friday, July 09, 2010 7:33 AM
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Hugo Kornelis (7/2/2010)
These rules are documented in Books Online. Use the index to find "data types [SQL Server]], precedence". Or read through the discussion, I believe I posted a link to this subject in the online version of BOL on one of the first pages.
No, the link is in one of Christian's posts (the 8th post in this topic) but not in either of your posts in the first 30 in this topic (where it would have been redundant after Christian's post).
Tom
Que conclure à la fin de tous mes longs propos? C'est que les préjugés sont la raison des sots. (Voltaire, 1756)
Post #949954
Suresh.Utham
Suresh.Utham
Posted Friday, July 09, 2010 11:21 AM
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interesting question!
Regards,
Suresh
Post #950127
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