PRI主键约束;UNI唯一约束;MUL可以重复。参考:http://www.codebit.cn/mysql/deleting-duplicate-rows-in-a-mysql-database.html
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数据库 时间:
2014-11-09 09:44:11
阅读次数:
231
Suppose a sorted array is rotated at some pivot unknown to you beforehand.
(i.e.,
0 1 2 4 5 6 7 might become
4 5 6 7 0 1 2).
Find the minimum element.
You may assume no duplicate exists in the ...
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其他好文 时间:
2014-11-06 17:35:17
阅读次数:
206
在我们的日常开发中,你是否遇到过这种情景:查看某条记录是否存在,不存在的话创建一条新记录,存在的话更新某些字段。你的处理方式是不是就是按照下面这样?$result = mysql_query('select * from xxx where id = 1');$row = mysql_fetch_a...
分类:
数据库 时间:
2014-11-05 16:18:34
阅读次数:
272
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->3->3->4->4->5, return
1->2->5.
Given
1...
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其他好文 时间:
2014-11-04 22:55:40
阅读次数:
300
问题描述:
Suppose a sorted array is rotated at some pivot unknown to you beforehand.
(i.e., 0 1 2 4 5 6 7 might become
4 5 6 7 0 1 2).
Find the minimum element.
You may assume no duplicate exists ...
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其他好文 时间:
2014-11-04 17:26:17
阅读次数:
253
报错:?duplicate?symbol?_OBJC_IVAR_$_XXXXX
?重复引用了?XXXXX?,找到并?delete-----》?remove?reference?就OK乐
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其他好文 时间:
2014-11-03 17:55:17
阅读次数:
186
Given a sorted linked list, delete all nodes that have duplicate numbers, leaving onlydistinctnumbers from the original list.For example,Given1->2->3-...
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其他好文 时间:
2014-11-02 13:41:39
阅读次数:
168
题目描述:
Suppose a sorted array is rotated at some pivot unknown to you beforehand.
(i.e., 0 1 2 4 5 6 7 might become 4
5 6 7 0 1 2).
Find the minimum element.
You may assume no duplicate...
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其他好文 时间:
2014-10-31 11:57:17
阅读次数:
201
Caching large objects, duplicate objects, caching collections, live objects, thread unsafe caching and other common mistakes break your app instead of...
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移动开发 时间:
2014-10-31 10:04:22
阅读次数:
263
使用RMAN进行复制时,RMAN会连接目标数据库和辅助实例,如果使用了catalog备份的还会连接恢复目录。RMAN连接了目标数据库才能够访问其控制文件中记录的备份的详细信息,连接辅助实例才能够在辅助实例上分配一个或多个通道进程,9i开始会自动创建通道;要连接辅助实例就先要启动..
分类:
数据库 时间:
2014-10-29 19:33:38
阅读次数:
299