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mysql删除重复记录,保存Id最小的一条
方法1:1、创建一个临时表,选取需要的数据。2、清空原表。3、临时表数据导入到原表。4、删除临时表。mysql> select * from student;+ + +| ID | NAME |+ + +| 11 | aa || 12 | aa || 13 | bb || 14 | bb || 15 ...
分类:数据库   时间:2017-07-17 11:17:37    阅读次数:183
深入mysql "ON DUPLICATE KEY UPDATE" 语法的分析
转:http://www.jb51.net/article/39255.htmmysql "ON DUPLICATE KEY UPDATE" 语法如果在INSERT语句末尾指定了ON DUPLICATE KEY UPDATE,并且插入行后会导致在一个UNIQUE索引或PRIMARY KEY中出现重复 ...
分类:数据库   时间:2017-07-14 14:45:34    阅读次数:195
316. Remove Duplicate Letters
Given a string which contains only lowercase letters, remove duplicate letters so that every letter appear once and only once. You must make sure your ...
分类:其他好文   时间:2017-07-14 13:15:31    阅读次数:195
图片相似性 d-hash算法 C#实践
参考: https://github.com/maccman/dhash http://blog.iconfinder.com/detecting-duplicate-images-using-python/ 讲的很详细 http://www.hackerfactor.com/blog/index. ...
分类:编程语言   时间:2017-07-13 20:25:42    阅读次数:302
关于rman duplicate 一些比較重要的知识点--系列三
FYI: http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta020.htm#RCMRF126 rman duplicate database 必须是同样的平台,可是支持32bit\64bit 间复制,在复制完毕后须要执行¥OR ...
分类:其他好文   时间:2017-07-11 21:04:19    阅读次数:211
82. Remove Duplicates from Sorted List II
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 ...
分类:其他好文   时间:2017-07-11 17:53:47    阅读次数:138
[Leetcode] search insert position 寻找插入位置
Given a sorted array and a target value, return the index if the target is found. If not, return the index where it would be if it were inserted in or ...
分类:其他好文   时间:2017-07-11 15:52:08    阅读次数:117
linux nginx service nginx restart [fail]
命令:nginx -t 查看失败原因: nginx: [emerg] "fastcgi_pass" directive is duplicate in /etc/nginx/sites-enabled/default:61 nginx: configuration file /etc/nginx/n ...
分类:系统相关   时间:2017-07-09 20:42:46    阅读次数:189
leetcode_sql_4,196
196. Delete Duplicate Emails Write a SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its  ...
分类:数据库   时间:2017-07-08 18:54:36    阅读次数:208
leetcode_sql_3,181,182,183
181. Employees Earning More Than Their Managers The Employee table holds all employees including their managers. Every employee has an Id, and there i ...
分类:数据库   时间:2017-07-08 18:41:21    阅读次数:213
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