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LeetCode (42): Trapping Rain Water
链接:https://leetcode.com/problems/trapping-rain-water/【描述】Givennnon-negative integers representing an elevation map where the width of each bar is 1, c...
分类:移动开发   时间:2015-10-08 09:05:56    阅读次数:255
Trapping Raining Water 解答
QuestionGivennnon-negative integers representing an elevation map where the width of each bar is 1, compute how much water it is able to trap after ra...
分类:移动开发   时间:2015-10-08 07:59:25    阅读次数:158
sql join 与where的区别
在公司里帮新人检查问题时发现,发现有人写的SQL不习惯用join语句,看着写的挺简单,但是数据量多了执行起来会很慢。仔细看,经常会在一个SQL查询中的from中写多个表,例如:select a.a1,a.a2,b.b1,b.b2 from a,b where a.a3=b.b3,其中a,b是表,a1...
分类:数据库   时间:2015-10-07 16:11:07    阅读次数:171
sql优化:
1、针对大数据量的,避免使用 or 操作select*from user_info where username like ‘yue%’ or username like '%yue'可优化成:select*from user_info where username like ‘yue%’ unio...
分类:数据库   时间:2015-10-07 15:54:38    阅读次数:132
ocp-155
QUESTION NO: 155 Which of the following parameters defines the location where Oracle should create archived redo logs?A. LOG_ARCHIVE_1 B. LOG_DESTINATION_1 C. LOG_ARCHIVED_DESTINATION_1 D. LOG_ARCH...
分类:其他好文   时间:2015-10-07 14:49:05    阅读次数:121
Operating System: Three Easy Pieces --- Page Fault (Note)
Recall that with TLB misses, we have two types of systems: Hardware managed TLBs (where thehardware looks in the page table to find the desired transl...
分类:其他好文   时间:2015-10-07 12:14:31    阅读次数:173
Gas Station 解答
ProblemThere areNgas stations along a circular route, where the amount of gas at stationiisgas[i].You have a car with an unlimited gas tank and it cos...
分类:其他好文   时间:2015-10-07 10:45:13    阅读次数:173
Save Money on Your Issues
Save Money on Your IssuesRandy Loomis, PMP Andover, Connecticut, U.S.oUR CoMPAny WAS USIng TRAInIng SoFTWARE that was five upgrades behind. We reached the point where it was so out of date that the ven...
分类:其他好文   时间:2015-10-07 08:36:15    阅读次数:176
Mysql——数据查询
关键字:1、简单查询select,from2、条件查询where,limit3、排序查询orderbydesc|asc4、分组查询groupby,having5、嵌套查询selectfrom(select...)6、多表查询innerjoin,outerjoin,...———————————————————————————————————————1、简单查..
分类:数据库   时间:2015-10-07 06:24:22    阅读次数:283
linq to object 未完待续
1.linq to stringstring s2 = "abc"; var data2 = s2.Where(x => x.CompareTo('a') > 0).ToList(); string s3 = ""; data2.For...
分类:其他好文   时间:2015-10-07 01:00:03    阅读次数:186
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