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How many rows?


How many rows?

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prajapati.amit123
prajapati.amit123
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Good One!
sknox
sknox
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hardik.doshi (8/27/2010)
ISNUMERIC is returing 0 so implicit conversation is not converting BLANK to ZERO. Therefore the reason behind this is something else.


Not so. You can easily prove that SQL Server does in fact convert blank strings to 0 with the following statement:

select cast('' as int)



ISNUMERIC doesn't work in this case because it doesn't actually try the conversion. It uses a different code path to determine whether a string is convertible to numeric, and that codepath does not follow exactly the same logic as the conversion code path. As Hugo said, this is best characterized as a bug in ISNUMERIC.

For a better example of why you shouldn't depend on ISNUMERIC, try the following two queries:

select cast('.' as float)



select isnumeric('.')



(edited to make final example more clear)
Cliff Jones
Cliff Jones
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Interesting question, thanks.
Daniel Bowlin
Daniel Bowlin
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Great question. QoTD regularly reinforces a best practice: make everything explicit.
SQLRNNR
SQLRNNR
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Thanks - we have another reason for ensuring specificity on our conversions.



Jason AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server, MVP


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Posting Performance Based Questions - Gail Shaw

mtillman-921105
mtillman-921105
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Good question - thanks!

______________________________________________________________________
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge. - Stephen Hawking
Danny Ocean
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I learn new thing.. thx :-)

Thanks
Vinay Kumar
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Tushar Kanti
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nice question..
Girl
Girl
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I so very agree
VM-723206
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Interesting question!
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