sql server 除法高精度多位小数除法溢出错误

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select         convert(numeric(16,2),(          round(convert(numeric(16,2),(replace([col1],',',''))),2)          /          case when (round(convert(numeric(16,2),(replace([col2],',',''))),2))          =0 then 0.000001          else (round(convert(numeric(16,2),(replace([col2],',',''))),2)) end          ))          from [tab1]