Error on Implicit conversion

Question

Hey I have a problem to this query, yesterday function normaly, but we reboot the server and now send me this error message:
Msg 245, Level 16, State 1, Line 1
Conversion failed when converting the varchar value 'sdv' to data type int.
this is the query, i wish to know what happend.
SELECT ZKA.[CHECKTIME], ZKA.[SENSORID], ATT.[DESCRIPTION_EN], ATT.[LOCATION], ATT.[SUBTYPE], UI.[USERID], UI.[NAME], UI.[TITLE]
FROM [att3000].[dbo].[CHECKINOUT] ZKA
INNER JOIN [att3000].[dbo].[Universal_Devices] ATT
ON ZKA.[SENSORID] = ATT.[FOREIGN_ID]
INNER JOIN [att3000].[dbo].[USERINFO] UI
ON ZKA.[USERID] = UI.[USERID]
WHERE ZKA.[CHECKTIME] BETWEEN '2014-06-06 00:00:00.000' AND '2014-06-06 23:59:59.999'
AND UI.[SSN] = 890 --
AND ATT.[SUBTYPE] <> 4
ORDER BY ZKA.[CHECKTIME] ASC

Answer 1

Check whether one of the following attributes contain a non integer value as implicit conversion is happening here:
--AND UI.[SSN] = 890 --
..AND ATT.[SUBTYPE] <> 4
SELECT *
FROM [att3000].[dbo].[USERINFO]
WHERE ISNUMERIC([SSN]) = 0
SELECT *
FROM [att3000].[dbo].[Universal_Devices]
WHERE ISNUMERIC([SUBTYPE]) = 0
For a quick check if thee and not the joined columns are the problem, you can also quote the values to be a string instead of a numeric value instead.
AND UI.[SSN] = '890' --
AND ATT.[SUBTYPE] <> '4'
Be aware that ISNUMERIC is not fully checking if the values are only [0-9] or of data types numeric as mentioned here:
http://www.codeproject.com/Articles/12254/Is-it-really-Numeric
-Jens
Jens K. Suessmeyer http://blogs.msdn.com/Jenss