In the processes data extracting, transforming, loading and data cleaning are involved both. In the model we use an ETL process tree to describe the ETL process.
本文工作的主要贡献和研究内容如下：1．给出了一个用于描述ETL过程的模型，称为ETL过程树，将异构数据转换、数据清理与查询树结合。
参考来源 - ETL若干关键技术研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Right-click the process in the process tree, and select Simulate.
在流程树中右键单击该流程，并选择 Simulate。
proc is a directory in which the files are really just views of the kernel and process tree.
proc 是一个目录，其中包含了反映内核和进程树的各种文件。
This is a success has been through the debugging process tree algorithm, and they hope to help everyone.
这是一个已经通过调试成功的二叉树算法程序，希望对大家有帮助。
应用推荐