// // main.m // 03-分类应用 // // Created by apple on 14-3-18. // Copyright (c) 2014年 apple. All rights reserved. // #import <Foundation/Foundation.h> /* 统计一个字符串中,出现的整数的个数 */ #import "NSString+NSStringExtend.h" int main(int argc, const cha…
有 字段A 和B比如数据如下A B1 21 31 4 2 22 3 统计出的sql结果: A count 1 3 2 2 select a,count(b) from t group by a;--或count(b) over (partition by a) 如统计一级会计科目数量的sql: select fo,count(dispname)from( select substr(subjcode,1,4) fo,bd_accsubj.dispname, bd_accs…
[1]README 1.1) 本代码在于读取内存中多个 内存段的地址范围描述符结构体(ARDS),有多少个内存段可以用: 1.2) source code and images in the blog from orange's implemention of a os 1.3) the comments towards code are built by myself , which proves to be a key point ,in my opinion. 1.4) for compl…