Choose Nearest Value from table - Error converting data type nvarchar to numeric.

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Hi All,

I want to choose nearest lower and upper values from table for that I am using below query

SQL

DECLARE @lat1 decimal(18,6)
DECLARE @lon1 decimal(18,6)

SET @lat1 = 17.43969
SET @lon1 = 78.4842

SELECT TOP 5 ID, Cl_Name,lat1,lon1 
from MyTable
ORDER BY ABS(cast(lat1 as decimal(18,6)) - @lat1)

If I run above query, it gives me below error-
Error converting data type nvarchar to numeric.

What is wrong in this query

Posted 15-Jul-14 1:39am

Prajakta V C

Updated 19-Jul-14 0:37am

v5

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CHill60 15-Jul-14 8:13am

What is your table definition (just ID, Cl_Name, lat1 and lon1)

[no name] 15-Jul-14 8:20am

No table contains - address, contact number,name and other columns
I want closest match value to lat1, lon1

CHill60 15-Jul-14 8:39am

I actually meant that I needed to see the datatypes. See the solution from OriginalGriff

[no name] 19-Jul-14 6:55am

Well you get that error for that exact same reason that you have already been told. And, TOP 5 is not the same as MIN and MAX.

3 solutions

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OriginalGriff · Answer 1 · 2014-07-15T02:37:00

Why are you casting your database value to a string, in order to try and take the absolute value of it? If it's numeric already, then it's a pointless waste of time - since it has to be converted back to a number again in order for ABS to work.
And if it's a string, then it does nothing useful either.

I'm guessing that you lat1 column contains string data, and that it contains characters that SQL isn't expecting as part of a number. If so, then you need to change your DB and store numeric values as numbers...or this problem will recur on a regular basis.

_Asif_ · Answer 2 · 2014-07-15T19:30:00

If this query was working well and now started getting fail then it seems that you have bad data in Lat1 column. You can identify these bad rows using following query. Once data gets corrected your own query will run fine.

SQL

SELECT ID, Cl_Name,lat1,lon1
FROM MyTable
WHERE ISNUMERIC(lat1) <> 1;

Ganeswar.B · Answer 3 · 2014-07-15T20:19:00

Solution 3

Hi Prajakta,
Do like below code.

SQL

DECLARE @lat1 decimal(18,6)
DECLARE @lon1 decimal(18,6)

SET @lat1 = 17.43969
SET @lon1 = 78.4842

SELECT TOP 5 ID, Cl_Name,@lat1,@lon1
from MyTable
ORDER BY ABS(cast(@lat1  as decimal(18,6)) - @lat1)

[Edit] By :Nirav Prabtani
Set language code block
[/Edit]

Posted 15-Jul-14 20:19pm

Ganeswar.B

Updated 15-Jul-14 20:24pm

v2

Choose Nearest Value from table - Error converting data type nvarchar to numeric.

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