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ISNUMERIC is not “ALL DIGITS”
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| Submitted on: |
6/4/2006 6:01:00 AM |
| By: |
Jeff Moden
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| Level: |
Advanced |
| User Rating: |
By 5 Users |
| Compatibility: |
SQL Server 2000 |
| Views: |
17781 |
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There are many cases where you need to ensure that the string data you are working with includes only numeric digits. Most Developers will use the built in ISNUMERIC function to make such a check. Here’s why that’s a bad idea and what to do about it.
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Other User Comments
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 6/6/2006 2:10:24 AM: VeeJay
Nice code. Is there a sure-fire way to insert or update dates without having to know the date format of the SQL Server. It often happens that the PC I am working on has a dd/MM/yyyy date format, but SQL Server (on a different machine has a date format of yyyy/MM/dd. How can I get around this?
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6/6/2006 10:43:56 AM: Jeff Moden
No, sorry... There is not. When the DD is less than 13, there's no way to correctly interpret automatically. The best thing to do is to set all machines to produce the date in the YYYYMMDD ISO format. However, if you are using GETDATE() to create the dates, it won't matter because it always does it correctly (underlying date serial is always correct regardless of format).
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6/16/2006 11:38:10 PM: ivan
i used to get around the problem by formating my client pc date to yyyy MMM dd. and it is always works. i have executable running in production and there is no problem report with that.
may be it could help
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4/6/2009 7:57:48 PM: Jeff Moden
Heh... just an observation... it's been almost 3 years and more than 13,000 people have viewed this article. Yet only 4 have taken the time to rate it. Either people can't see where to rate the articles on this sight, or they just can't be bothered. Either way, it's amazing to me... and this isn't the only site where people just stab'n'grab.
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11/12/2009 10:53:49 AM: Julie
I bet one of the reasons so few people have voted is because they don't want to register with the site. Thanks for another excellent article, Jeff. I've learned so much from your contributions and it's greatly appreciated.
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