explain+sql语句explain返回的结果项很多,这里我们只关注三种,分别是type,key,rows。possible_keys表明的是这次查找中所用到的索引,rows是指这次查找数据所扫描的行数(这里可以先这样理解,但实际上是内循环的次数),type则是本文要详细记录的连接类型,前两项重...
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数据库 时间:
2015-11-10 17:49:07
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191
Given a set of distinct integers,nums, return all possible subsets.Note:Elements in a subset must be in non-descending order.The solution set must not...
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其他好文 时间:
2015-11-10 15:50:07
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210
Remove Invalid ParenthesesRemove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.Note: ...
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编程语言 时间:
2015-11-08 14:07:26
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492
Remove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.Note: The input string may conta...
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其他好文 时间:
2015-11-07 13:35:07
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484
QuestionRemove the minimum number of invalid parentheses in order to make the input string valid. Return all possible results.Note: The input string m...
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其他好文 时间:
2015-11-07 06:38:09
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201
Given a collection of numbers, return all possible permutations.For example,[1,2,3]have the following permutations:[1,2,3],[1,3,2],[2,1,3],[2,3,1],[3,...
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其他好文 时间:
2015-11-04 14:32:13
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143
# Redis configuration file example# Note on units: when memory size is needed, it is possible to specifiy# it in the usual form of 1k 5GB 4M and so fo...
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其他好文 时间:
2015-11-03 12:06:32
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275
mfc110ud.dll not found while debugging vs2012 MFC application.Possible Solutions:1) >>>>>>> Answered by magicandre1981fromVisual Studio 2013 - MSVCR11...
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编程语言 时间:
2015-11-02 19:07:29
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235
51. Using many symbols makes it possible to put a large amount of inFORMation on a single map. 51.使用多种多样的符号可以在一张地图里放进大量的信息。 52. Anarchism is a term describing a cluster of ...
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其他好文 时间:
2015-11-02 14:06:28
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317
Given a strings1, we may represent it as a binary tree by partitioning it to two non-empty substrings recursively.Below is one possible representation...
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其他好文 时间:
2015-10-30 20:12:45
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207