How To Check Numeric Values In A Varchar Field

Feb 11, 2003

Hi all,

I have a field defined as varchar(8) but this field should not contain any letters, needs to be only numbers. How can I validate the data if it contains only numbers? Any ideas?

Thanks,
Jannat.

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T-SQL (SS2K8) :: Using Not Like To Filter Out Non-numeric Values From Varchar Field

Mar 26, 2014

I am putting a SELECT statement together where I need to evaluate a results field, to determine how the color indicator will show on a SSRS report. I am running into a problem when I try to filter out any non-numeric values from a varchar field, using a nested CASE statement.

For example, this results field may contain values of '<1', '>=1', '1', '100', '500', '5000', etc. For one type of test, I need a value of 500 or less to be shown as a green indicator in a report, and any value over that would be flagged as a red. Another test might only allow a value of 10 or less before being flagged with a red.

This is why I setup a CASE statement for an IndicatorValue that will pass over to the report to determine the indicator color. Using CASE statements for this is easier to work with, and less taxing on the report server, if done in SQL Server instead of nested SSRS expressions, especially since a variety of tests have different result values that would be flagged as green or red.

I have a separate nested CASE statement that will handle any of the values that contain ">" or "<", so I am using the following to filter those out, and then convert it to an int value, to determine what the indicator value should be. Here is the line of the script that is erring out"

case when (RESULT not like '%<%') or (RESULT not like '%>%') then
CASE WHEN (CONVERT(int, RESULT) between 0 and 500) THEN '2'
ELSE '0'

The message I am getting is: Conversion failed when converting the varchar value '<1' to data type int.

I thought a "not like" statement would not include those values for converting to an int, but that does not seem to be working correctly. I did also try moving the not to show as "not RESULT like", and that did not change the message.

How I can filter out non-numeric values before converting the rest of the varchar field (RESULT) to int, so that it is only converting actual numbers?

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Thanks!

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Jan 4, 2000

I am not sure if this is the right place, but here's my question:

with a field being varchar, can only the rows that are numeric be selected? For example-

ID Data1
1 don
2 jerry
3 3030
4 1234
5 susan
6 4321

Does SQL have an IsNumeric type function that can be used in the where clause?

Don

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Hi All,

I have a table Saleshistory with 89481412 records. I have a field Sales of nvarchar type, all the records in this field are numeric, and the records are with 2 decimal places. I expect all the records to be ending at .00 (for example 5.00,345.00,25.00), but I want to verify if something is for example 5.6 etc.

So in short I want to check if any Salesrecords have more than zero values in the decimal. How can I check this.

Please help.

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T-SQL (SS2K8) :: Arithmetic Overflow Error Converting Varchar To Data Type Numeric Message When Field Is Decimal

Apr 3, 2014

I am trying to setup an indicator value for an SSRS report to show green and red values on a report, based on the NRESULT value. The problem I am facing is that I have several different CASE statements that have the same logic, and they are processing just fine. NRESULT is a decimal field, so no conversion should be necessary. I do not know why I am getting the "Arithmetic overflow error converting varchar to data type numeric." error message.

Below is the CASE statement where the error is occurring. It is in the part of the ELSE CASE. The first CASE works just fine when the ELSE CASE is commented out. If I also change the ELSE CASE statement to say "else case when LEFT(NRESULT,1) = '-' then '0'", then it processes fine, too, so it has to be something I am missing something in the check on negative values. I do need the two checks, one for positive and one for negative values, to take place.

case when LEFT(NRESULT,1) <> '-' then --This portion, for checking positive values, of the CASE statement works fine.
CASE WHEN LEFT(ROUND(NRESULT,2),4) between 0.00 and 0.49 THEN '2' --Green
ELSE CASE WHEN LEFT(ROUND(NRESULT,2),4) > 0.49 THEN '0' --Red
ELSE '3' --White
END
END
else case when LEFT(NRESULT,1) = '-' then --This portion, for checking negative values, of the CASE statement is producing the conversion error message.

[code]....

I checked the NRESULT field, and there are not any NULL values in there, either.

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I was able to insert the following values:
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