DescriptionIn the game of DotA, Pudge’s meat
hook is actually the most horrible thing for most of the heroes. The hook is
made up of several consecuti...
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其他好文 时间:
2014-05-05 11:32:29
阅读次数:
288
类似这样的语句在mysql oracle 是可以执行成功的,select * from
classfirst where (classid ,classname) not in (select classid, classname from
classfirst where classid=2 )但...
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数据库 时间:
2014-05-05 11:15:31
阅读次数:
386
最简单的方式是使用 mysql 的 ORDER BY RAND() 子句。SELECT
col1 FROM tbl ORDER BY RAND() LIMIT
10;它能很好的运行在小表中。然而,对于大表,生成随机列表行时将产生一个严重的性能问题,MYSQL 需要对每一行进行随机,然后对它们排序。即...
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数据库 时间:
2014-05-05 11:04:53
阅读次数:
483
1.1 Hour 1 - Understanding Windows Workflow
Foundation1.1.1 What workflow is in generalA workflow is logic-consisting of one
or more steps that are pr...
Given a non-negative number represented as an array
of digits, plus one to the number.The digits are stored such that the most
significant digit is at...
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其他好文 时间:
2014-05-04 19:46:18
阅读次数:
372
js工具类的功能有:
1、去掉字符串前后空格
2、清空select
3、验证手机号
4、字符串转换int型数字
5、获取checkbox的选中的值
6、去掉左边的空白
7、去掉邮编的空白
源码如下:
/**
* 去掉字符串前后空格
*
* @param str
* @returns
*/
function trim(str){
return str.re...
分类:
Web程序 时间:
2014-05-04 18:50:51
阅读次数:
420
很多时候我们会出现如下情境,如果一条数据在表中已经存在,对其做update,如果不存在,将新的数据插入.如果不使用Oracle提供的merge语法的话,可能先要上数据库select查询一下看是否存在,然后决定怎么操作,这样的话需要写更多的代码,同时性能也不好,要来回数据库两次.使用merge的话则可以一条SQL语句完成.
1)主要功能
提供有条件地更新和插入数据到数据库表中
如果该行存在...
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数据库 时间:
2014-05-04 18:48:52
阅读次数:
527
Birthday Candles
The chef is preparing a birthday cake for one of his guests,
and his decided to write the age of the guest in candles on the cake.
There are 10 types of candles, one for each o...
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其他好文 时间:
2014-05-04 18:46:55
阅读次数:
416
After a long and successful day of preparing food for the banquet, it is time to clean up. There is a list of n jobs to do before the kitchen can be closed for the night. These jobs are indexed from 1...
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其他好文 时间:
2014-05-04 18:25:07
阅读次数:
384
??
SQL Server online consultants came across an interesting scenario where one of our client was unable to restore a native SQL Server backup successfully performed from one instance running on M...
分类:
数据库 时间:
2014-05-04 17:42:50
阅读次数:
394