SQL Clone
SQLServerCentral is supported by Redgate
 
Log in  ::  Register  ::  Not logged in
 
 
 


More fun with ISNUMERIC()


More fun with ISNUMERIC()

Author
Message
UMG Developer
UMG Developer
SSCertifiable
SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)SSCertifiable (7.3K reputation)

Group: General Forum Members
Points: 7258 Visits: 2204
Nice questions thanks! Yet more reasons to not use ISNUMERIC for most things.
Oleg Netchaev
Oleg Netchaev
Hall of Fame
Hall of Fame (3.1K reputation)Hall of Fame (3.1K reputation)Hall of Fame (3.1K reputation)Hall of Fame (3.1K reputation)Hall of Fame (3.1K reputation)Hall of Fame (3.1K reputation)Hall of Fame (3.1K reputation)Hall of Fame (3.1K reputation)

Group: General Forum Members
Points: 3082 Visits: 1910
Toreador (7/6/2010)

That doesn't explain why isnumeric('1 234') = 0, despite being in the standard format for any locale with a space as the thousands separator!

What I mentioned in my post was related only to the trailing spaces behavior. In other words

select cast('1234      ' as int);



is fine because the trailing spaces are removed before cast kicks in, but

select cast('1 234' as int);



will never fly simply because it is not a valid way to represent the number in every locale (though it is valid in some of them).

select 
isnumeric('1234 ') trailing_yep,
isnumeric('1 234') middle_nope;


returns

trailing_yep middle_nope
------------ -----------
1 0


in the environment I use.

Oleg
SanjayAttray
SanjayAttray
SSCrazy Eights
SSCrazy Eights (8.4K reputation)SSCrazy Eights (8.4K reputation)SSCrazy Eights (8.4K reputation)SSCrazy Eights (8.4K reputation)SSCrazy Eights (8.4K reputation)SSCrazy Eights (8.4K reputation)SSCrazy Eights (8.4K reputation)SSCrazy Eights (8.4K reputation)

Group: General Forum Members
Points: 8429 Visits: 1619
different answer for different sql versions.

SQL 2005 and 2008 gives 21 while 2000 with nvarchar(8000) throws error

Msg 2717, Level 16, State 2, Line 1
The size (8000) given to the parameter '@String' exceeds the maximum allowed (4000).
Parameter '@String' has an invalid data type.

giving varchar(8000) would give 20 answer.

20 (9), (10), (11), (12), (13), $(36), +(43), ,(44), -(45), .(46), 0(48), 1(49), 2(50), 3(51), 4(52), 5(53), 6(54), 7(55), 8(56), 9(57),

Thanks for a good question.

SQL DBA.
KevinC.
KevinC.
Ten Centuries
Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)

Group: General Forum Members
Points: 1081 Visits: 504
Excellent question. Thanks.

Also, thanks to Oleg and Duncan for their explanations.
ziangij
ziangij
SSCarpal Tunnel
SSCarpal Tunnel (4.5K reputation)SSCarpal Tunnel (4.5K reputation)SSCarpal Tunnel (4.5K reputation)SSCarpal Tunnel (4.5K reputation)SSCarpal Tunnel (4.5K reputation)SSCarpal Tunnel (4.5K reputation)SSCarpal Tunnel (4.5K reputation)SSCarpal Tunnel (4.5K reputation)

Group: General Forum Members
Points: 4499 Visits: 380
thanks Duncan :-)

I also had the same issue... was getting the count 20 but didn't know why... its because of the compatibility level set to 80..
Toreador
Toreador
SSCertifiable
SSCertifiable (6K reputation)SSCertifiable (6K reputation)SSCertifiable (6K reputation)SSCertifiable (6K reputation)SSCertifiable (6K reputation)SSCertifiable (6K reputation)SSCertifiable (6K reputation)SSCertifiable (6K reputation)

Group: General Forum Members
Points: 5967 Visits: 8281
Oleg Netchaev (7/6/2010)

select cast('1 234' as int);



will never fly simply because it is not a valid way to represent the number in every locale (though it is valid in some of them).


that's the bit I can't understand. Does the same not apply to
isnumeric('1.234,56')


yet this returns 1?
Olga B
Olga B
Ten Centuries
Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)Ten Centuries (1.1K reputation)

Group: General Forum Members
Points: 1084 Visits: 455
Toreador (7/7/2010)

that's the bit I can't understand. Does the same not apply to
isnumeric('1.234,56')


yet this returns 1?


I wonder if it's because ISNUMERIC disregards the position of the comma? For instance,

isnumeric('123,45.7')



returns 1

As does
isnumeric('12345.67,89')



I also noticed that converting a string of numbers with a comma anywhere in it (e.g., '12,345') to a numeric value results in an error, even though ISNUMERIC returns 1 on that string.
SQLRNNR
SQLRNNR
SSC Guru
SSC Guru (145K reputation)SSC Guru (145K reputation)SSC Guru (145K reputation)SSC Guru (145K reputation)SSC Guru (145K reputation)SSC Guru (145K reputation)SSC Guru (145K reputation)SSC Guru (145K reputation)

Group: General Forum Members
Points: 145007 Visits: 18651
thanks for the QOD

Jason...AKA CirqueDeSQLeil
_______________________________________________
I have given a name to my pain...MCM SQL Server, MVP
SQL RNNR
Posting Performance Based Questions - Gail Shaw
Learn Extended Events

Jeff Moden
Jeff Moden
SSC Guru
SSC Guru (509K reputation)SSC Guru (509K reputation)SSC Guru (509K reputation)SSC Guru (509K reputation)SSC Guru (509K reputation)SSC Guru (509K reputation)SSC Guru (509K reputation)SSC Guru (509K reputation)

Group: General Forum Members
Points: 509753 Visits: 44288
Olga B (7/7/2010)
I also noticed that converting a string of numbers with a comma anywhere in it (e.g., '12,345') to a numeric value results in an error, even though ISNUMERIC returns 1 on that string.


Heh... "It depends"... ;-)
 SELECT ISNUMERIC('1,2,3,4,5,6,7,8,9'),
CAST('1,2,3,4,5,6,7,8,9' AS MONEY)




By definition, ISNUMERIC will return a 1 if the operand can be converted to ANY numeric value using ANY numeric datatype conversion... not just the ones you expect.

--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.
If you think its expensive to hire a professional to do the job, wait until you hire an amateur. -- Red Adair

Helpful Links:
How to post code problems
How to post performance problems
Forum FAQs
pparsons
pparsons
SSC-Enthusiastic
SSC-Enthusiastic (177 reputation)SSC-Enthusiastic (177 reputation)SSC-Enthusiastic (177 reputation)SSC-Enthusiastic (177 reputation)SSC-Enthusiastic (177 reputation)SSC-Enthusiastic (177 reputation)SSC-Enthusiastic (177 reputation)SSC-Enthusiastic (177 reputation)

Group: General Forum Members
Points: 177 Visits: 159
I'd be curious to see what the expected result is for the 21 count. I use SQL2K and long ago ended up creating my own IsNumeric function because of the issues with the native version, so assumed based on the comma issue the "right" answer was most likely 21 (comma is treated differently in SQL2K vs. SQL2K5). I read mention of the character 92, which was weird to me, and with the other variants on answers it only goes to show (IMO) the uselessness of this function
Go


Permissions

You can't post new topics.
You can't post topic replies.
You can't post new polls.
You can't post replies to polls.
You can't edit your own topics.
You can't delete your own topics.
You can't edit other topics.
You can't delete other topics.
You can't edit your own posts.
You can't edit other posts.
You can't delete your own posts.
You can't delete other posts.
You can't post events.
You can't edit your own events.
You can't edit other events.
You can't delete your own events.
You can't delete other events.
You can't send private messages.
You can't send emails.
You can read topics.
You can't vote in polls.
You can't upload attachments.
You can download attachments.
You can't post HTML code.
You can't edit HTML code.
You can't post IFCode.
You can't post JavaScript.
You can post emoticons.
You can't post or upload images.

Select a forum








































































































































































SQLServerCentral


Search