?
Solved

Convert VarChar to Numeric in WHERE Clause

Posted on 2013-06-10
9
Medium Priority
?
3,274 Views
Last Modified: 2013-06-11
I have the following query that has been working for years

AgencyDefinField is a VarChar

SELECT     *
FROM         Accounts
WHERE     (CONVERT(numeric, AgencyDefinField) = 4765765)

Beginning Today I started getting the following message

Microsoft ODBC SQL server driver [SQL Server ] Error converting data type varchar to numeric

I have two Questions:
1.  What could have cause the problem to only now appear
2.  How to fix it

Any help would be appreciated.

Thanks,
Phil
0
Comment
Question by:Phil Chapman
9 Comments
 
LVL 4

Accepted Solution

by:
BAKADY earned 2000 total points
ID: 39236027
maybe works this, or you have values like '4765765.00' then not.
SELECT     *
FROM         Accounts
WHERE     rtrim(ltrim(AgencyDefinField)) = '4765765'

Open in new window

the problem are the values in AgencyDefinField, maybe NULL or empty strings.

you can try ISNUMERIC-function too
SELECT     *
FROM         Accounts
WHERE     CASE WHEN ISNUMERIC(AgencyDefinField) THEN CAST(AgencyDefinField as NUMERIC) ELSE 0 END = 4765765

Open in new window

t
0
 
LVL 93

Expert Comment

by:Patrick Matthews
ID: 39236095
Almost always, this type of error is caused by having a [n][var]char value that is not convertible to a numeric.

BAKADY's second SQL statement above handles that scenario by forcing a return of zero.

You can utilize that approach to find out which record(s) are causing you difficulty:

SELECT     *
FROM         Accounts
WHERE     ISNUMERIC(AgencyDefinField) = 0

Open in new window

0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 39236318
It's better from a performance perspective to filter the opposite way i.e. amend the criteria to suit that data. This way indexes can be used by the query.

e.g.

SELECT     *
FROM         Accounts
WHERE     AgencyDefinField = convert(varchar,4765765) -- or nvarchar

if the field is only supposed to carry strings of digits then there may be data you need to correct, however I'd still suggest filtering by conversion of criteria to suit the field's data type.
0
Get expert help—faster!

Need expert help—fast? Use the Help Bell for personalized assistance getting answers to your important questions.

 
LVL 4

Expert Comment

by:BAKADY
ID: 39236325
what about if the field AgencyDefinField is '4765765.00' ????
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 39236355
Would you pass that on that request via an integer? (wouldn't advise it)

SELECT     *
FROM         Accounts
WHERE     AgencyDefinField =  '4765765.00'
0
 
LVL 4

Expert Comment

by:BAKADY
ID: 39237018
Is the author no more interested in our answers????
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 39237029
2013-06-11 at 06:31:30
2013-06-11 at 18:39:50
duration = 12:08:20
such enthusiasm :)
0
 
LVL 2

Author Closing Comment

by:Phil Chapman
ID: 39237446
I found the problem, someone had removed the number and left the the field flank.
0
 
LVL 49

Expert Comment

by:PortletPaul
ID: 39237462
that would do it :)
0

Featured Post

Free Tool: SSL Checker

Scans your site and returns information about your SSL implementation and certificate. Helpful for debugging and validating your SSL configuration.

One of a set of tools we are providing to everyone 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

I am showing a way to read/import the excel data in table using SQL server 2005... Suppose there is an Excel file "Book1" at location "C:\temp" with column "First Name" and "Last Name". Now to import this Excel data into the table, we will use…
So every once in a while at work I am asked to export data from one table and insert it into another on a different server.  I hate doing this.  There's so many different tables and data types.  Some column data needs quoted and some doesn't.  What …
SQL Database Recovery Software repairs the MDF & NDF Files, corrupted due to hardware related issues or software related errors. Provides preview of recovered database objects and allows saving in either MSSQL, CSV, HTML or XLS format. Ensures recov…
Stellar Phoenix SQL Database Repair software easily fixes the suspect mode issue of SQL Server database. It is a simple process to bring the database from suspect mode to normal mode. Check out the video and fix the SQL database suspect mode problem.

589 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