一、使用SELECT子句进行多表查询
SELECT 字段名 FROM 表1,表2 … WHERE 表1.字段 = 表2.字段 AND 其它查询条件
SELECT a.id,a.name,a.address,a.date,b.math,b.english,b.chinese FROM tb_demo065_tel AS b,tb_demo065 AS a WHERE a.id=b.id
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数据库 时间:
2015-07-15 15:13:26
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208
1、演示多列转为单行
数据文件及内容: student.txt
xiaoming|english|92.0
xiaoming|chinese|98.0
xiaoming|math|89.5
huahua|chinese|80.0
huahua|math|89.5
创建表studnet:
create table student(name string,subject strin...
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其他好文 时间:
2015-07-09 00:54:01
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166
原文 I arrived in London at last. The railway station was big, black and dark. I did not know the way to my hotel, so I asked a porter. I not only spoke English very carefully, but very clearly as ...
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其他好文 时间:
2015-07-08 14:58:24
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108
要得到某一天是星期几,需要用到 SQL Server 中的日期函数:datename()。今天是星期几,例子 1: set language N'English'select datename(weekday, getdate()) Wednesday今天是星期几,例子 2: set l...
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数据库 时间:
2015-07-07 16:09:04
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212
Problem C. Bilingual
Problem
Elliot's parents speak French and English to him at home. He has heard a lot of words, but it isn't always clear to him which word comes from which language! E...
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其他好文 时间:
2015-07-06 10:17:34
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156
Problem Description
Now you are back,and have a task to do:
Given you a string s consist of lower-case English letters only,denote f(s) as the number of distinct sub-string of s.
And you have som...
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编程语言 时间:
2015-07-05 23:58:10
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557
在这个D:\Program Files\National Instruments\TestStand 2014\Components\Language\English\文件夹下,更改相关配置文件即可!D:\Program Files\National Instruments\TestStand 20...
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编程语言 时间:
2015-07-05 21:02:33
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633
六月的英语路程如何呢?现在,突然,回想有点模糊,不确切,此时,真的感觉我缺少了记录!在英语方面,我留下的感受真的是有点少,以后,要多留下点东西啦!
这次的英语总结,想纠正一下自己的态度。自己到底应该把自己的态度摆在一个什么样的位置呢!想到一句话:学精于勤,荒于嬉;行成于思,毁于随。大家看到这句话,都可以知道他的意思,但和这句话,我们都还有一定的距离,让我们多多勤奋,多多思考。分享...
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其他好文 时间:
2015-07-04 09:46:37
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115
BBC:http://www.bbc.co.uk/learningenglish/ VOA:http://learningenglish.voanews.com/? 11个老师,近200个小时的免费英语学习视频:http://www.engvid.com/english-lessons/? 奥巴马每周演讲:https://www.w...
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其他好文 时间:
2015-07-01 22:18:16
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275
This artical will be published in English as well:http://www.cnblogs.com/LarryAtCNBlog/p/4613320.html如果你的环境里刚好有VMware vCenter,里面加了一堆ESX(i)服务器的话,那以下的脚本...
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系统相关 时间:
2015-07-01 17:40:29
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286