where vs having当一个sql语句中存在where子句,会先执行where,然后执行group by,然后执行having.一般来说,only use 'having' when you use 'group by'Always use 'having' with aggregate f...
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其他好文 时间:
2014-07-07 16:58:32
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183
http://www.sconsolidator.com/updateInstallationTo use SConsolidator, you first have to installSCons(version 2.0 is the minimum requirement). SConsolid...
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系统相关 时间:
2014-07-07 16:19:42
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458
alias ll='ls -al'use_color=false# Set colorful PS1 only on colorful terminals.# dircolors --print-database uses its own built-in database# instead of ...
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其他好文 时间:
2014-07-07 13:41:54
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245
1、滚动组件。有时候需要在网页中的各个部分跳转,类似于回到首页的功能,给点动画当然是极好的。JQuery插件AnimateScroll就是解决这个问题的。使用方法类似这样:$('#use').animatescroll({scrollSpeed:1500, easing:'easeOutCubic'...
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Web程序 时间:
2014-07-07 13:04:13
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170
http://kashyapc.com/2014/01/27/virt-builder-to-trivially-create-various-linux-distribution-guest-images/ I frequently use virt-builder (part of libgue...
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系统相关 时间:
2014-06-30 23:21:25
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359
1 下载 Sublime Text 2 http://www.sublimetext.com/2 下载Nodejs插件,下载ZIP包 https://github.com/tanepiper/SublimeText-Nodejs3 解压ZIP,重命名为Nodejs4 将Nodejs复制到C:\Use...
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Windows程序 时间:
2014-06-30 20:53:39
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4835
Weekly golfers will find a bag that gives them enough space to do a lot of tees, balls, sticks, and whatever he deems necessary for the golf course. P...
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其他好文 时间:
2014-06-30 20:52:39
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258
var ivar = [:]
ivar.className // __NSDictionaryI
var i = 1
i.className // error: 'Int' does not have a member named 'className'
If you want to get the type of a primitive, you have to use brid...
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移动开发 时间:
2014-06-30 20:14:35
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311
Blocks are a way to define a block of code that you will use at a later time.Sometimes people refer to blocks as anonymous functions because they are ...
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其他好文 时间:
2014-06-30 15:21:04
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220
题目
Given a m x n matrix, if an element is 0, set its entire row and column to 0. Do it in place.
Follow up:
Did you use extra space?
A straight forward solution using O(mn) space is probab...
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其他好文 时间:
2014-06-30 06:17:09
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245