1少用countdb.testcol1.find({xxx:15}).count()2避免large-skipdb.testcol1.find({xxx:15}).skip(100000).limit(10)3不用notin
分类:
数据库 时间:
2015-06-12 15:06:46
阅读次数:
100
There are a total ofncourses you have to take, labeled from0ton - 1.Some courses may have prerequisites, for example to take course 0 you have to firs...
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其他好文 时间:
2015-06-12 09:52:41
阅读次数:
125
here are a total ofncourses you have to take, labeled from0ton - 1.Some courses may have prerequisites, for example to take course 0 you have to first...
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其他好文 时间:
2015-06-12 09:49:39
阅读次数:
116
service mysqld stopmysqld_safe –skip-grant-tables –user=mysql& // 跳过授权表 mysql.user 和 mysql.dbmysql -urootset password=password("yourpasswd"); // 出现报.....
分类:
数据库 时间:
2015-06-12 00:46:41
阅读次数:
159
关于sensor的缩放存在两种模式 binning mode 和skip modeskipping mode 就是把想要的数据采集上来 把其余的数据扔掉 如下所示 column skip 2 row skip 2 留下的就是白色的像素 黑色的像素丢掉。binning mode 就是把相邻的像素合成一...
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其他好文 时间:
2015-06-11 16:15:05
阅读次数:
138
1.IQueryable接口与IEnumberable接口的区别: IEnumerable 泛型类在调用自己的SKip 和 Take 等扩展方法之前数据就已经加载在本地内存里了,而IQueryable 是将Skip ,take 这些方法表达式翻译成T-SQL语句之后再向SQL服务器发送命令,它并不是...
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其他好文 时间:
2015-06-10 23:48:14
阅读次数:
148
修改my.cnf文件(一般在/etc/my.cnf),在[mysqld]节点中添加一行 skip-grant-tables(启动mysql时不启用授权表),然后重启mysql服务器(/etc/init.d/mysqld restart)重启完以后用mysql可直接进入mysql命令行,然后修改mys...
分类:
数据库 时间:
2015-06-10 19:05:04
阅读次数:
173
Description
You and your friend are playing a game in which you and your friend take turns removing stones from piles. Initially there are N piles witha1, a2, a3,..., aN number
of stones. On ...
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其他好文 时间:
2015-06-10 14:14:53
阅读次数:
114
Alice and Bob are playing a game with marbles; you may have played this game in childhood. The game is playing by alternating turns. In each turn a player can take exactly one or two marbles.Both Alice...
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其他好文 时间:
2015-06-09 22:05:33
阅读次数:
166
There are a total of n courses you have to take, labeled from 0 to n - 1.Some courses may have prerequisites, for example to take course 0 you have to...
分类:
编程语言 时间:
2015-06-09 21:28:54
阅读次数:
110