从SQLSERVER 2005新增isnumeric函数，返回1则字符串是数值，返回0则认为不是数值
但里面有些其他的字符也返回1，不知道是怎么个思路，是不是花旗国的规则？
SELECT ISNUMERIC ('123.456') AS '123.456', --1
ISNUMERIC ('-') AS '-', -- 1
ISNUMERIC ('+') AS '+', -- 1
ISNUMERIC ('$') AS '$', -- 1
ISNUMERIC ('.') AS '.', -- 1
ISNUMERIC (',') AS ',', -- 1
ISNUMERIC ('\') AS '\', -- 1
ISNUMERIC ('1D1') AS '1D1', -- 1
ISNUMERIC ('1E1') AS '1E1', -- 1
ISNUMERIC ('1d1') AS '1d1', -- 1
ISNUMERIC ('1e1') AS '1e1', -- 1
ISNUMERIC ('d') AS 'd', -- 0
ISNUMERIC ('e') AS 'e' -- 0
标签：数字,--,1D1,SQLSERVER,1e1,1d1,ISNUMERIC From： https://www.cnblogs.com/shichq/p/16934774.html