1.首先,我们来介绍第一种方式:◆查询的SQL语句如下:select row_number() over (order by name) as rowid, sysobjects.[name] from sysobjects◆运行的结果:rowid name1 all_columns2 all_ob...
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数据库 时间:
2014-07-24 17:28:45
阅读次数:
342
从A表随机取2条记录,用SELECT TOP 10 * FROM ywle order by newid()order by 一般是根据某一字段排序,newid()的返回值 是uniqueidentifier ,order by newid()随机选取记录是如何进行的newid()在扫描每条记录的时...
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数据库 时间:
2014-07-24 17:12:35
阅读次数:
345
Problem Description
A little girl loves programming competition very much. Recently, she has found a new kind of programming competition named "TopTopTopCoder". Every user who has registered in "To...
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其他好文 时间:
2014-07-24 10:27:14
阅读次数:
301
题目:You are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes contain a sin....
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编程语言 时间:
2014-07-24 10:01:23
阅读次数:
223
Permutation SequenceThe set[1,2,3,…,n]contains a total ofn! unique permutations.By listing and labeling all of the permutations in order,We get the fo...
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其他好文 时间:
2014-07-23 22:11:47
阅读次数:
327
from http://www.itpub.net/thread-1852897-1-1.html有论坛朋友在上面的帖子里问SQL为什么不走索引,正好这两天我也刚刚在看SQL优化,于是试着回答了一下.下面是原来的SQL:select o.order_id as orderIdfrom order_i...
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数据库 时间:
2014-07-23 22:11:27
阅读次数:
350
--MySQL SQL优化-------------------2014/07/23几种order by的情况 乍一看这个问题好像有点复杂,我们从最简单的case开始看起。 用这个表来说明:(10w行数据)1、 最简单的order ―― order by索引字段从explain的结果来看(Extra...
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数据库 时间:
2014-07-23 20:49:45
阅读次数:
309
Add Two NumbersYou are given two linked lists representing two non-negative numbers. The digits are stored in reverse order and each of their nodes co...
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其他好文 时间:
2014-07-23 16:51:51
阅读次数:
251
题意:
要求在一个特殊的图上找最大匹配,该图特点是:无向图,每个节点度数为3,是一个边双连通分量(the graph is 2-edge-connected (that is, at least 2 edges need to be removed in order to make the graph disconnected) 这一点是这样理解的把。。)
思路:
一般想法就直接建图求最大匹...
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其他好文 时间:
2014-07-23 13:22:07
阅读次数:
207
Rating
Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 213 Accepted Submission(s): 126
Special Judge
Problem Description
A little girl lov...
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其他好文 时间:
2014-07-23 13:10:26
阅读次数:
242