Oracle知识点
ps:由于是自己看的所以笔记比较乱,大家谅解CommitrollbackSql核心语句之selectSelct中要用到以下语句From语句Where语句Groupby语句Groupby来进行分组,分组的参数如果有重复的,只返回一个行值.(比如我按id分组如果记录中有两个id为1....
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数据库 时间:
2014-05-19 22:37:42
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492
这是参数类型约束,指定T必须是Class类型。.NET支持的类型参数约束有以下五种:where T :
struct | T必须是一个结构类型where T : class | T必须是一个Class类型where T : new() |
T必须要有一个无参构造函数where T : NameOfB...
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其他好文 时间:
2014-05-19 20:50:40
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268
2- You may have question marks in your head,
especially regarding where the probabilities in the Expectation step come from.
Please have a look at the...
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其他好文 时间:
2014-05-19 11:47:33
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312
遇到的问题:当点击上面的logs时,会出现下面问题:这个解决方案为:By default,
Hadoop stores the logs of each container in the node where that container was
hosted. While this is irre...
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其他好文 时间:
2014-05-19 10:33:13
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369
class TableInfo where T : new() { public
TableInfo() { Type type = typeof(T); TableAttribute tableattr = ty...
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其他好文 时间:
2014-05-19 09:29:01
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210
把下面页面封装名字为dbhelper.php 页面 1
封装dbhelper.php调用方法,增、删、查、改 数据库里表的数据1include("dbhelper.php");2 $r =
mysql_bind("select * from users where userName=? and pa...
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数据库 时间:
2014-05-17 14:20:23
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313
【题目】
Given n non-negative integers a1, a2, ..., an, where each represents a point at coordinate (i, ai). n vertical lines are drawn such that the two endpoints of line i is at (i, ai) and (i, 0). Find two lines, which together with x-axis forms a contain...
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其他好文 时间:
2014-05-16 01:32:47
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406
hello.ns-- 创建模块 Main 首字母大写module Main where--
导入可能用到的模块import System.Environment-- haskell 程序首先会执行 Main模块的 main action-- main
:: IO () 是type 声明, 这里可省略...
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其他好文 时间:
2014-05-15 22:21:02
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334
String slctpsql="select id ,"+uid+","+ddd+","+score+",'"+mark+"' ,"+markid+" ,"+exam.getId()+" from Test_Paper where testBaseId=(select id from Test_Base where baseTestId="+judgemap.get(i).getId()+" a...
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数据库 时间:
2014-05-15 20:36:45
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434
Problem Description
At the entrance to the university, there is a huge rectangular billboard of size h*w (h is its height and w is its width). The board is the place where all possible announcement...
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其他好文 时间:
2014-05-15 19:48:31
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348