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
Problem Description:Given a 2D board containing'X'and'O', capture all regions surrounded by'X'.A region is captured by flipping all'O's into'X's in th...
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2014-07-07 16:20:26
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216
Given a sorted linked list, delete all nodes that have duplicate numbers, leaving only distinct numbers from the original list.For example,Given 1->2-...
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其他好文 时间:
2014-07-07 16:17:00
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139
Problem Description:Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.For example,"A man, a...
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2014-07-07 16:03:32
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168
Problem Description:Say you have an array for which theithelement is the price of a given stock on dayi.If you were only permitted to complete at most...
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其他好文 时间:
2014-07-07 15:24:05
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206
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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2014-07-07 13:41:54
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245
安装了Oracle VM VirtualBox后,发现原来虚拟机VMware中的centos不能上网。第一步:进入网络管理(window7 是网络和共享中心),然后点击更改适配器设置。第二步:右键禁用掉VirtualBox Host-Only Network 的网络服务,然后再右键选在属性。第三步:...
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其他好文 时间:
2014-07-07 13:40:39
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272
Given a sorted linked list, delete all duplicates such that each element appear only once.
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其他好文 时间:
2014-07-02 00:33:49
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204
ajax json 表格排序,分页,自定义每页数量 点击表头可以排序,按照升序或者降序,另外支持多列排序设置每页数量演示 XML/HTML Codetable id='example3'> thead> tr> th>IDth> th>First nameth> th>Last nameth> th>Gradeth> th>Grade 2th> th>Efficie...
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Web程序 时间:
2014-06-30 00:13:41
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262
1、域名查询接口采用HTTP,POST,GET协议:调用URL:http://panda.www.net.cn/cgi-bin/check.cgi参数名称:area_domain值为标准域名,例:hichina.com调用举例:http://panda.www.net.cn/cgi-bin/check.cgi?area_domain=teapic.com返回XML:<?xmlversion="1.0"encoding=..