With below three situation, we can use the pseudocolumncolumn_value to refer the column value.an XMLTABLEconstruct without the columnsclauseTABLE func...
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其他好文 时间:
2014-07-29 10:48:16
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198
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(...
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数据库 时间:
2014-07-28 21:27:54
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315
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...
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其他好文 时间:
2014-07-28 16:06:03
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234
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect#hibernate.dialect=org.hibernate.dialect.Oracle10gDialecthibernate.cache.use_second_level_cache=t...
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系统相关 时间:
2014-07-28 15:10:03
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223
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...
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数据库 时间:
2014-07-28 15:01:03
阅读次数:
262
create database logs;use logscreate table weblogs_from_hdfs(md5varchar(32),urlvarchar(64),request_datedate,request_timetime,ipvarchar(15));sqoop expor...
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数据库 时间:
2014-07-28 14:47:33
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387
Through its implementation, this project will familiarize you with the creation and execution of threads, and with the use of the Thread class methods...
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编程语言 时间:
2014-07-28 14:44:03
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467
#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)) ...
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移动开发 时间:
2014-07-28 14:42:53
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308
Typical recurrsion\DFS problem. Just take care of memory use.class Solution {public: vector> ret; void go(int currMaxN, int currK, int k, unorde...
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其他好文 时间:
2014-07-28 11:35:40
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240
A real-time operating system (RTOS) for use with minimal-memory controllers has a kernel for managing task execution, including context switching, a p...
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其他好文 时间:
2014-07-28 11:25:50
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302