题目描述 Recently Irina arrived to one of the most famous cities of Berland — the Berlatov city. There are n showplaces in the city, numbered from 1 to n ...
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其他好文 时间:
2018-12-30 17:28:57
阅读次数:
179
Given a binary tree, return the zigzag level order traversal of its nodes' values. (ie, from left to right, then right to left for the next level and ...
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其他好文 时间:
2018-12-29 11:09:36
阅读次数:
121
原文 ASP.NET Core supports the dependency injection (DI) software design pattern, which is a technique for achieving Inversion of Control (IoC) between ...
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Web程序 时间:
2018-12-28 12:02:26
阅读次数:
258
列如: select * from goods where g_time between to_date('2018/12/26 10:01:59','yyyy-MM-dd hh:mm:ss') and to_date('2018/12/26 10:05:17',' yyyy-MM-dd hh:mm ...
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其他好文 时间:
2018-12-27 18:32:07
阅读次数:
172
1. 应尽量避免在 where 子句中使用!=或<>操作符,否则将引擎放弃使用索引而进行全表扫描。 2.对查询进行优化,应尽量避免全表扫描,首先应考虑在 where 及 order by 涉及的列上建立索引。 3.应尽量避免在 where 子句中对字段进行 null 值判断,否则将导致引擎放弃使用索 ...
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数据库 时间:
2018-12-27 00:30:15
阅读次数:
156
Well-placed labels can be the difference between a sloppy map and a beautiful one. Labels need to clearly identify features without obscuring the map. ...
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编程语言 时间:
2018-12-26 20:10:10
阅读次数:
428
I just finished a demo which is to provide an easy way to control hardware resources of A sample. The communication between PC and A sample is UART. T ...
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编程语言 时间:
2018-12-26 15:54:43
阅读次数:
439
开发过程中 经常遇到时间问题,这个要仔细分析,主要跟找准参照物。 比如这段 实际项目中用到的参照物选择今天的时间 用笔在纸上画一条直线,画2个点 第一个点是当前时间,第二个点是7天后的时间 然后判断enddate 在这2个点的左边,还是中间,还是右边 思路就很清晰~以后做到这样的问题 就很简单了~~ ...
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Web程序 时间:
2018-12-24 16:18:46
阅读次数:
202
Few examples to show you how to use Java 8 Duration, Period and ChronoUnit objects to find out the difference between dates. 1. Duration Example A jav ...
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编程语言 时间:
2018-12-22 19:37:24
阅读次数:
150
条件: select * from test where nid > 3; select * from test where nid between 3 and 6; select * from test where nid in (1,2,4,5); select * from test wher ...
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数据库 时间:
2018-12-22 16:28:58
阅读次数:
199