原文 用SQL语句,删除掉重复项只保留一条在几千条记录里,存在着些相同的记录,如何能用SQL语句,删除掉重复的呢1、查找表中多余的重复记录,重复记录是根据单个字段(peopleId)来判断 select * from people where peopleId in (select peopleId...
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数据库 时间:
2015-05-12 13:05:51
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136
NO SILVER BULLET: ESSENCE AND ACCIDENTS OF SOFTWARE ENGINEERINGIt's adapted from berkeley . If you want to know more, you visit the orignal articleher...
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其他好文 时间:
2015-05-12 12:55:34
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146
#include
using namespace std;
#define INF 0x7ffffff
#define maxn 100000
struct Edge
{
int from, to, cap, flow;
Edge(int u, int v, int c, int f):from(u), to(v), cap(c), flow(f){}
};
int n, ...
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其他好文 时间:
2015-05-12 11:32:19
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89
1.在线文档 http://www.crummy.com/software/BeautifulSoup/bs4/doc/
2.常用方法
选择器 find_all(name, attrs, recursive, text, limit, **kwargs)
3.主要调用方法
4.完整代码
#-*- coding:utf-8 -*-
from bs4 import B...
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其他好文 时间:
2015-05-12 11:29:48
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118
【题目】
Given a sorted array, remove the duplicates in place such that each element appear only once and return the new length.
Do not allocate extra space for another array, you must do this in ...
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其他好文 时间:
2015-05-12 11:24:49
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92
iOS programming Code Snippet Library The freebie code comes from the code snippet library. 代码来自code snippet library。 Notice that there are a number of...
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移动开发 时间:
2015-05-12 11:02:44
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114
Adding In-App Purchase to your iOS and OS X ApplicationsIn-App Purchase allows you to sell additional features and functionality from within your iOS ...
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移动开发 时间:
2015-05-12 11:01:16
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381
1、创建唯一标识: create table zz(id uniqueidentifier,name nvarchar(10) ); insert into zz(name) values('zmt'); select newid() from zz;2、区别: ...
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数据库 时间:
2015-05-12 10:58:36
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164
1、Oracle分页查询写法:select*from(selectrownum,namefromtablewhererownum<=endIndex)whererownum>startIndex2、DB2分页查询SELECT*FROM(Select字段1,字段2,字段3,rownumber()over(ORDERBY排序用的列名ASC)ASrnfrom表名)ASa1WHEREa1.rnBETWEEN10AND20以上表示提取第10..
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数据库 时间:
2015-05-12 09:41:26
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190
比如已经创建好一个表 表名为“28165“ 复制这个表。 CREATE TABLE [33150] AS SELECT * FROM [28165]
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数据库 时间:
2015-05-12 06:53:57
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184