FROM: http://tennysusantobi.blogspot.com/2012/08/netezza-external-tables.html Netezza External Tables   You can use Netezza's external table to view data from an external file and use it like a database table. When you create an external table, the a…

Oracle数据库允许对外部表中的数据进行只读访问.外部表定义为不驻留在数据库中的表,并且可以是为其提供访问驱动程序的任何格式.通过为数据库提供描述外部表的元数据,数据库能够公开外部表中的数据,就好像它是驻留在常规数据库表中的数据一样.可以使用SQL直接和并行查询外部数据. 例如,可以SELECT,JOIN或ORDER外部表数据.还可以为外部表创建视图和同义词.但是,在外部表上不能进行DML操作(UPDATE,INSERT或DELETE),也不能创建索引.外部表还提供了一个框架,用于将任意SEL…

cd to you local files address key the word: git clone -0 github https://github.com/xxxxxxxxx Done....…

How do I force an overwrite of local files on a git pull? I think this is the right way: $ git fetch --all $ git reset --hard origin/master $ git fetch downloads the latest from remote without trying to merge or rebase anything. Then the $git reset r…

AutoMySQLBackup备份时,出现mysqldump: Got error: 1142: SELECT, LOCK TABLES command denied to user 'root'@'localhost' for table 'accounts' when using LOCK TABLES错误,具体内容如下所示 [root@DB-Server ~]# /usr/bin/automysqlbackup /etc/automysqlbackup/myserver.conf Pars…

最佳解决方法 重要提示:如果您有任何本地更改,将会丢失.无论是否有--hard选项,任何未被推送的本地提交都将丢失. 如果您有任何未被Git跟踪的文件(例如上传的用户内容),这些文件将不会受到影响. 下面是正确的方法: git fetch --all 然后,你有两个选择: git reset --hard origin/master 或者如果你在其他分支上: git reset --hard origin/<branch_name> 说明: git fetch从远程下载最新的,而不尝试合并或r…

The scenario is about Business Secret and our client do worry about data leakage. They want to know whether Suspect copy those data to external hard drive or not. In fact it is not easy for Forensic guys to answer this question. Of course if you copy…

Hive Tutorial 目录 Hive Tutorial 1.Concepts 1.1.What Is Hive 1.2.What Hive Is NOT 1.3.Getting Started 1.4.Data Units 1.5.Type System 1.5.1.Primitive Types 1.5.2.Complex Types 1.5.3.Timestamp 1.6.Built In Operators and Functions 1.6.1.Built In Operators…

Programming Impala Applications The core development language with Impala is SQL. You can also use Java or other languages to interact with Impala through the standard JDBC and ODBC interfaces used by many business intelligence tools. For specialized…

131. Which view would you use to display the column names and DEFAULT valuesfor a table?A. DBA_TABLESB. DBA_COLUMNSC. USER_COLUMNSD. USER_TAB_COLUMNSAnswer: DSELECT COLUMN_NAME,DECODE(DATA_TYPE,'DATE' , DATA_TYPE ,'NUMBER' , DATA_TYPE ||DECODE(DATA_S…