候选码(candidate key) 若关系中的某一个属性和属性组值能够唯一能够唯一标识一个元组,则称该属性或者属性组为候选码 主码(primary key) 若一个关系有多个候选码,则挑选其中一个作为主码 主属性(key attribute) 包含在任何候选码中属性成为主属性 外码(foreign ...
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数据库 时间:
2017-05-13 16:57:37
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234
etcd是一种先进的key-value的存储系统,本文主要是学习etcd的心得,如有误解,敬请拍砖主要分成三种形式的选举,先说一下etcd节点的三种状态,分别为leader,candidate和follower第一种:初始选举A、B、C、D现在进场,那么谁当领导呢?A(变身candidatae)就分别找BCD谈话,“我来..
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其他好文 时间:
2017-05-11 22:21:54
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482
题目: Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers s ...
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其他好文 时间:
2017-05-07 23:13:56
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217
题目: Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each ...
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其他好文 时间:
2017-05-07 22:03:07
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231
Android Studio 1.0RC1 版本号公布。 下面是官网该版本号说明: Android Studio 1.0 Release Candidate 1 November 20th, 2014: For information on what's new in 1.0 RC1, see th ...
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移动开发 时间:
2017-04-23 22:25:18
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337
题目: Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T. Each ...
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其他好文 时间:
2017-04-15 12:06:55
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169
Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers sums ...
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其他好文 时间:
2017-03-17 12:04:52
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125
Xiaoguang Tu (涂晓光): CV: Ph.D. Candidate of School of Communication and Information Engineering, University of Electronic Science and Technology of Chi ...
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其他好文 时间:
2017-03-03 12:08:35
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134
Given a set of candidate numbers (C) (without duplicates) and a target number (T), find all unique combinations in C where the candidate numbers sums ...
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其他好文 时间:
2017-02-11 11:18:38
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155
Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.Each numb... ...
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其他好文 时间:
2017-02-09 00:54:27
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275