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How Many Tables(并查集)
http://acm.hdu.edu.cn/showproblem.php?pid=1213How Many TablesTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/32768 K (Java/Others)Total Subm...
分类:其他好文   时间:2015-07-30 16:32:10    阅读次数:97
How Many Tables--hdu1213(并查集)
How Many TablesTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 18165Accepted Submission(s): 8942Pr...
分类:其他好文   时间:2015-07-29 22:55:42    阅读次数:185
HDU 1213 How Many Tables
How Many Tables Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 18146    Accepted Submission(s): 8936 Problem Description Today is Ig...
分类:其他好文   时间:2015-07-29 21:26:28    阅读次数:115
Hive
show databases;show tables;use zzz;//使用一个database;create table wyp(id int, name string,age int, tel string)ROW FORMAT DELIMITEDFIELDS TERMINATED BY '\...
分类:其他好文   时间:2015-07-29 21:09:46    阅读次数:98
hdu杭电1213 How Many Tables【并查集】
Problem Description Today is Ignatius' birthday. He invites a lot of friends. Now it's dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the frien...
分类:其他好文   时间:2015-07-29 19:24:00    阅读次数:109
Spark SQL and DataFrame Guide(1.4.1)——之DataFrames
Spark SQL是处理结构化数据的Spark模块。它提供了DataFrames这种编程抽象,同时也可以作为分布式SQL查询引擎使用。DataFramesDataFrame是一个带有列名的分布式数据集合。等同于一张关系型数据库中的表或者R/Python中的data frame,不过在底层做了很多优化;我们可以使用结构化数据文件、Hive tables,外部数据库或者RDDS来构造DataFrames...
分类:数据库   时间:2015-07-29 17:22:28    阅读次数:196
oracle11g exp导出问题:部分表导不出来
在oracle导出表的命令exp时候发现一个问题,就是部分表完全的导不出来,经检查发现只要是表为空的都会导不出来。 在如下表中发现segment_created都为NO的是导不出来的,经查询后,将语句提取出来执行即可。 select 'alter table '|| table_name ||' allocate extent;'  from user_tables where segmen...
分类:数据库   时间:2015-07-29 14:11:51    阅读次数:186
[转] Oracle analyze 命令分析
转自:http://blog.sina.com.cn/s/blog_682841ba0101bncp.html1.analyze table t1 compute statistics for table; -->user_tables(只对表的总体信息进行统计,比如行数多少等,不涉及到表字段)2....
分类:数据库   时间:2015-07-28 20:47:46    阅读次数:152
杭电1213--How Many Tables(并查集)
How Many TablesTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 18006Accepted Submission(s): 8856Pr...
分类:其他好文   时间:2015-07-27 13:04:40    阅读次数:73
LeeCode(Database)-Customers Who Never Order
Suppose that a website contains two tables, theCustomerstable and theOrderstable. Write a SQL query to find all customers who never order anything.Tab...
分类:数据库   时间:2015-07-27 12:48:29    阅读次数:249
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