http://stackoverflow.com/questions/228532/difference-between-char-isdigit-and-char-isnumber-in-c-sharp Char.IsDigit() is a subset of Char.IsNumber(). Some of the characters that are 'numeric' but not digits include 0x00b2 and 0x00b3 which are supersc
右击function选择新增 如果是数字返回本身,如果不是数字返回0: create or replace function isNumber(p in varchar2) return number is Result number;begin result := to_number(p); return result; exception when VALUE_ERROR then return 0;end isNumber; 不用定义functino的一种方法: 当a.sta