How to get a row number which is failing during conversion

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How to get a row number which is failing during conversion

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SqlSavvy

Posted Friday, January 23, 2009 9:23 AM

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I have about 20000 records in the SELECT clause and one of them is failing during conversion spitting out the following error message. "Arithmetic overflow error converting varchar to data type numeric.
" Is there a way to find out which row is failing?

Post #642566

steveb.

Posted Friday, January 23, 2009 9:38 AM

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There will probably be a row that has a character that cannot be converted to integer.

try using this code to find the offending row(s)

SELECT * FROM YourTable
WHERE ISNUMERIC(YourColumn)=0

Post #642589

SqlSavvy

Posted Friday, January 23, 2009 9:41 AM

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Thanks for the reponse.

But that is not going to work because I am only selecting the records where ISNUMERIC(mycloumn) = 1.

Post #642592

Christopher Stobbs

Posted Friday, January 23, 2009 9:48 AM

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Steve, cause it's an overflow I recon it's not that there is char

Also be careful because
This will return a 1 for ISNUMERIC but it's not convertible: '10,0'.

What I normally do is run a top until I find a subset of data that contains my bad value and then I go from there.
What data type are you converting to?

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Post #642600

Jack Corbett

Posted Friday, January 23, 2009 9:48 AM

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Check out the BOL entry for IsNumeric. "+", "-", ".", and currency symbols are all considered Numeric. Change your where clause to:

Where
     Column NOT LIKE '%[^0-9]%'

This says only allow numbers ignoring all other characters. If you want to allow decimals and negatives you can add the necessary characters to the mask.

Jack Corbett

Applications Developer

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Post #642601

SqlSavvy

Posted Friday, January 23, 2009 9:50 AM

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Converting to deciman(12,7)

Post #642603

steveb.

Posted Friday, January 23, 2009 9:51 AM

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Okay sorry i mis-read the question..

It seems like the value is too big to fit into a numeric column

Post #642605

Christopher Stobbs

Posted Friday, January 23, 2009 9:53 AM

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Also your select statement will normally return a number of rows before it actually falls over so you could use that as a point in the DB to start looking for bad data

e.g

DECLARE  @TMP TABLE 
(COl1 VARCHAR(100))
INSERT INTO @tmp
SELECT '1' UNION ALL
SELECT '1111111111111111111111' 

SELECT CAST(col1 as decimal(12,7))
FROM @tmp

This fails but it also return one row, so I know that it's after the first row etc...

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Try to learn something about everything and everything about something. - Thomas Henry Huxley

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Post #642611

Christopher Stobbs

Posted Friday, January 23, 2009 9:57 AM

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The only other thing I can think of it to return all rows that have a Len(Col) greater than what your decimal can hold and look at those

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Try to learn something about everything and everything about something. - Thomas Henry Huxley

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Post #642617

Christopher Stobbs

Posted Friday, January 23, 2009 10:05 AM

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Ok assuming all your values are numeric then try this:
in the where clause

	CHARINDEX('.',col1) > 6
	OR 
	(CHARINDEX('.',col1) = 0 AND LEN(col1) > 5)

Here is my example for returning values that would overflow.

DECLARE  @TMP TABLE 
(COl1 VARCHAR(100))
INSERT INTO @tmp
SELECT '1' UNION ALL
SELECT '1' UNION ALL
SELECT '1' UNION ALL
SELECT '1' UNION ALL
SELECT '1' UNION ALL
SELECT '1' UNION ALL
SELECT '1' UNION ALL
SELECT '1' UNION ALL
SELECT '1' UNION ALL
SELECT '92345.1234567' UNION ALL
SELECT '12345.12345671' UNION ALL
SELECT '123456.1234567' UNION ALL
SELECT '111111111111111111111111111111' UNION ALL
SELECT '1234567890'

SELECT 
	--CAST(col1 as decimal(12,7))
	col1
FROM @tmp
WHERE 
	CHARINDEX('.',col1) > 6
	OR 
	(CHARINDEX('.',col1) = 0 AND LEN(col1) > 5)

----------------------------------------------
Try to learn something about everything and everything about something. - Thomas Henry Huxley

w00t

Posting Best Practices
Numbers / Tally Tables

SQL-4-Life

Post #642625

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