In order to avoid such error you could use CASE
+ ISNUMERIC
to handle scenarios when you cannot convert to int.
Change
CONVERT(INT, CONVERT(VARCHAR(12), a.value))
To
CONVERT(INT, CASE WHEN IsNumeric(CONVERT(VARCHAR(12), a.value)) = 1 THEN CONVERT(VARCHAR(12),a.value) ELSE 0 END)
Basically this is saying if you cannot convert me to int assign value of 0 (in my example)
Alternatively you can look at this article about creating a custom function that will check if a.value
is number: http://www.tek-tips.com/faqs.cfm?fid=6423
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