一.on duplicate key update语句 如果您指定了ON DUPLICATE KEY UPDATE,并且插入行后会导致在一个UNIQUE索引或PRIMARY KEY中出现重复值,则执行旧行UPDATE。例如,如果列a被定义为UNIQUE,并且包含值1,则以下两个语句具有相同的效果:....
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其他好文 时间:
2015-04-19 14:30:35
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160
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->1-...
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其他好文 时间:
2015-04-18 13:11:39
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121
Description:Write a SQL query to find all duplicate emails in a table named Person. 找出表中重复的Email。# Write your MySQL query statement belowselect Email....
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其他好文 时间:
2015-04-18 09:59:11
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119
题目SQL query to delete all duplicate email entries in a table named Person, keeping only unique emails based on its smallest Id.
Id
Email 1
john@example.com
2
bob@example.com
3
john@examp...
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其他好文 时间:
2015-04-17 11:25:03
阅读次数:
100
build.gradle加入 android?
{
????packagingOptions?{
????????exclude?
‘META-INF/LICENSE.txt‘
????}
}
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Web程序 时间:
2015-04-16 12:38:23
阅读次数:
133
目录目录
题目
解题思路
AC SQL题目Write a SQL query to find all duplicate emails in a table named Person.
Id
Email 1
a@b.com
2
c@d.com
3
a@b.com
For example, your query should return the following fo...
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其他好文 时间:
2015-04-14 14:38:54
阅读次数:
154
problem:
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...
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其他好文 时间:
2015-04-13 19:03:43
阅读次数:
121
Given a set of distinct integers, S, return all possible subsets.
Note:
Elements in a subset must be in non-descending order.The solution set must not contain duplicate subsets.
For exa...
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其他好文 时间:
2015-04-13 16:46:47
阅读次数:
130
将android-support-multidex.jar放到libs下然后编译,出现如下错误:Error:Execution failed for task ':app:packageAllDebugClassesForMultiDex'.
> java.util.zip.ZipException: duplicate entry: android/support/multidex/MultiDex.class...
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移动开发 时间:
2015-04-13 16:43:04
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384
13980. Record Keeping
Constraints
Time Limit: 1 secs, Memory Limit: 256 MB
Description
Farmer John has been keeping detailed records of his cows as they enter the barn for milking. E...
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其他好文 时间:
2015-04-13 12:59:47
阅读次数:
132