SQL 检查 Varchar 是否能转换为 NUMERIC

https://bbs.csdn.net/topics/390480323

ISNUMERIC(size_long)=1

(IIF( ISNUMERIC(size_long)=1
AND ISNUMERIC(size_wide)=1
AND ISNUMERIC(size_high)=1 ,CONVERT(DECIMAL,size_high)+CONVERT(DECIMAL,size_long)+CONVERT(DECIMAL,size_wide),0)