查看 tblBenchmarkData 的模式定义会很有帮助，但您可以尝试在查询中使用 ISNUMERIC.类似的东西:

It would be helpful to see the schema definition of tblBenchmarkData, but you could try using ISNUMERIC in your query. Something like:

SET DataValue = CASE WHEN ISNUMERIC(DataValue)=1 THEN CAST(DataValue AS float) * 1.335 
                     ELSE 0 END