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
Solved

ISNUMERIC() equivalent?

Posted on 2001-09-13
4
1,144 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
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 100 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

Free Tool: Subnet Calculator

The subnet calculator helps you design networks by taking an IP address and network mask and returning information such as network, broadcast address, and host range.

One of a set of tools we're offering as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

Title # Comments Views Activity
Work with Sybase data using SQL Server 2008 7 423
Alternative to ALTER in Sybase 1 401
Reading ASE Optimizer trace flag / switch output 4 598
MS SQL Linked server 3 135
IT certifications are a concrete representation of continual learning on the part of the candidate.  Continual learning is necessary for the long term success of an IT professional, but are IT certifications the right path for you?
Some of the SEO trends we might expect in 2017.
This video shows how to use Hyena, from SystemTools Software, to bulk import 100 user accounts from an external text file. View in 1080p for best video quality.
With Secure Portal Encryption, the recipient is sent a link to their email address directing them to the email laundry delivery page. From there, the recipient will be required to enter a user name and password to enter the page. Once the recipient …

808 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