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05. 取SQL分组中的某几行数据
原文:05. 取SQL分组中的某几行数据对表中数据分组,有时只需要某列的聚合值;有时却需要返回整行数据,常用的方法有:子查询、ROW_NUMBER、APPLY,总体感觉还是ROW_NUMBER比较直观。测试数据: if OBJECT_ID('testGroup') is not null drop ...
分类:数据库   时间:2014-09-06 12:10:43    阅读次数:353
POJ2752 (Seek the Name, Seek the Fame,kmp)
传送门Seek the Name, Seek the FameTime Limit: 2000MSMemory Limit: 65536KDescriptionThe little cat is so famous, that many couples tramp over hill and dal...
分类:其他好文   时间:2014-09-04 22:03:40    阅读次数:240
SSL连接建立过程分析(1)
Https协议:SSL建立过程分析web訪问的两种方式:http协议,我们普通情况下是通过它訪问web,由于它不要求太多的安全机制,使用起来也简单,非常多web网站也仅仅支持这样的方式下的訪问.https协议(Hypertext Transfer Protocol over Secure Socke...
分类:其他好文   时间:2014-09-04 20:51:30    阅读次数:284
SqlServer 使用 row_number分页
select?*?from?(select?row_number()over(order?by?Server_no?desc)?as?rownum,Server_no,Game_Name,Server_name?from?T_GameServer_List?where?IS_DELETE?=?‘N‘?and?Game_name?like?‘%q%‘)a...
分类:数据库   时间:2014-09-03 21:23:27    阅读次数:215
UVA - 11637 Garbage Remembering Exam (组合+概率)
Little Tim is now a graduate,and is thinking about higher studies. However, he first needs to appear in anexam whose preparation alone includes memorizing the meanings of over 3500words! After going ...
分类:其他好文   时间:2014-09-03 13:10:06    阅读次数:241
13 Reasons Why You Should Pay Attention to Mobile Web Performance
Mobile is no longer on the sidelines. If you’re not already thinking mobile first, you should at least consider it. Let’s go over compelling data that...
分类:Web程序   时间:2014-09-03 10:50:56    阅读次数:235
zoj 3747
Attack on Titans Time Limit: 2 Seconds      Memory Limit: 65536 KB Over centuries ago, mankind faced a new enemy, the Titans. The difference of power between mankind and their newfound enemy was...
分类:其他好文   时间:2014-09-03 09:44:47    阅读次数:297
The JSR-133 Cookbook for Compiler Writers
The JSR-133 Cookbook for Compiler Writers by Doug Lea, with help from members of the JMM mailing list. dl@cs.oswego.edu. Preface: Over the 10+ years since this was initially written, many process...
分类:Web程序   时间:2014-09-03 09:40:06    阅读次数:432
mysql 实现row_number,获取上一条,下一条
代码思路如下:select *,(@row_num:=@row_num+1) as row_no from stc_output,(select(@row_num:=0)) b;select * from (select *,(@row_num:=@row_num+1) as row_no from...
分类:数据库   时间:2014-09-02 19:33:35    阅读次数:253
row_number() over order by与利用rownum查询分页效率分析
实际测试:数据库:70万条数据查询第10000页,每页10条。row_number() 耗时: 2.2秒rownum 耗时:1.3秒查询第20000页,每页10条。row_number() 耗时: 4.5秒+rownum 耗时:3.8秒+ 网上看到的说,row_number()效率最高看来是没有经....
分类:其他好文   时间:2014-09-02 13:58:14    阅读次数:216
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