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COLUMN_VALUE Pseudocolumn
With below three situation, we can use the pseudocolumncolumn_value to refer the column value.an XMLTABLEconstruct without the columnsclauseTABLE func...
分类:其他好文   时间:2014-07-29 10:48:16    阅读次数:198
mysql explain 命令解释
转载http://bzyyc.happy.blog.163.com/blog/static/6143064720115102551554/key实 际使用的索引。如果为NULL,则没有使用索引。很少的情况下,MYSQL会选择优化不足的索引。这种情况下,可以在SELECT语句中使用USE INDEX(...
分类:数据库   时间:2014-07-28 21:27:54    阅读次数:315
wscript:329: error: Could not autodetect OpenSSL support. Make sure OpenSSL development packages are
安装node错误: wscript:329: error: Could not autodetect OpenSSL support. Make sure OpenSSL development packages are installed. Use configure --without-ssl to disable this message. 说明没有安装   openssl-de...
分类:其他好文   时间:2014-07-28 16:06:03    阅读次数:234
hibernate.properties
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect#hibernate.dialect=org.hibernate.dialect.Oracle10gDialecthibernate.cache.use_second_level_cache=t...
分类:系统相关   时间:2014-07-28 15:10:03    阅读次数:223
sqoop从mysql导入到hdfs
1、mysql-- 创建数据库create database logs;-- 使用use logs;-- 创建表create table weblogs(md5varchar(32),urlvarchar(64),request_datedate,request_timetime,ipvarchar...
分类:数据库   时间:2014-07-28 15:01:03    阅读次数:262
sqoop从hdfs导出到mysql
create database logs;use logscreate table weblogs_from_hdfs(md5varchar(32),urlvarchar(64),request_datedate,request_timetime,ipvarchar(15));sqoop expor...
分类:数据库   时间:2014-07-28 14:47:33    阅读次数:387
java线程例子登山
Through its implementation, this project will familiarize you with the creation and execution of threads, and with the use of the Thread class methods...
分类:编程语言   时间:2014-07-28 14:44:03    阅读次数:467
umount移动硬盘遇到device is busy问题
#umount /mnt/fourtumount: /mnt/fourt: device is busy. (In some cases useful info about processes that use the device is found by lsof(8) or fuser(1)) ...
分类:移动开发   时间:2014-07-28 14:42:53    阅读次数:308
LeetCode "Combinations"
Typical recurrsion\DFS problem. Just take care of memory use.class Solution {public: vector> ret; void go(int currMaxN, int currK, int k, unorde...
分类:其他好文   时间:2014-07-28 11:35:40    阅读次数:240
Multi-tasking RTOS for microprocessors with limited memory by saving only a single return address per task during context switching
A real-time operating system (RTOS) for use with minimal-memory controllers has a kernel for managing task execution, including context switching, a p...
分类:其他好文   时间:2014-07-28 11:25:50    阅读次数:302
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