?
Solved

ISNUMERIC() equivalent?

Posted on 2001-09-13
4
Medium Priority
?
1,149 Views
Last Modified: 2012-05-04
Don't ask me why, but a colleague has a need for the equivalent of MS SQL Server's ISNUMERIC() function in Transact SQL. Is there a stored proc somewhere already that can accomplish the feat pretty quickly?

I'd search PAQ, but it doesn't seem to be working!
0
Comment
Question by:dwalex
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 5

Expert Comment

by:amitpagarwal
ID: 6481657
I have written the following SP for sybase to check if a given string is Numeric. It returns 0 if numeric else -1.

You can modify it to have print statements also.

Thanks.

  create proc isNumber @value varchar(15)
as
begin
 declare @number_count int
 declare @decimal_count int
 select  @decimal_count = 0
 select  @number_count = char_length(@value)
  while (@number_count > 0)
   begin
    if(substring(@value,@number_count,1)
  IN ('0','1','2','3','4','5','6','7','8','9','.'))
     begin
      select @number_count = @number_count - 1
      if(substring(@value,@number_count,1) = '.')
       begin
        select @decimal_count = @decimal_count + 1
        if(@decimal_count > 1)
 
         return -1
       end
     end
   else return -1
  end
 return 0
end
0
 
LVL 3

Accepted Solution

by:
mathavra earned 400 total points
ID: 6488444
Here is another method I have used

select patindex('%[^0-9]%', "123R23")
go
------------
           4

will return non-zero value if any of character is non-numeric. Else, it will return zero.

select patindex('%[^0-9]%', "123023")
go
------------
           0

You can use this function anywhere to check whether it returns zero or non-zero.

Hope this helps!

Mathav
0
 
LVL 10

Expert Comment

by:bret
ID: 6488861
Neither of these techniques work for negative numbers, or for numbers in scientific notation (-3.456e5)

-bret
0
 
LVL 1

Author Comment

by:dwalex
ID: 6489244
That's the kind of quick answer I was after. As bret says, it's not perfect, but for a financial application, it helps alot.
0

Featured Post

On Demand Webinar: Networking for the Cloud Era

Ready to improve network connectivity? Watch this webinar to learn how SD-WANs and a one-click instant connect tool can boost provisions, deployment, and management of your cloud connection.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

The Summer 2017 Scholarship Winners have been announced!
Hey fellow admins! This time, I have a little fairy tale for you. As many tales do, it starts boring and then gets pretty gory. I hope you like it. TL;DR: It is about an important security matter, you should read it if you run or administer Windows …
In this video we outline the Physical Segments view of NetCrunch network monitor. By following this brief how-to video, you will be able to learn how NetCrunch visualizes your network, how granular is the information collected, as well as where to f…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question