删除表test，并释放空间，将test删除的一干二净。 删除表test里的内容，并释放空间，但不删除表的定义，表的结构还在。 仅删除表test内的所有内容，保留表的定义，不释放空间。 DELETE FROM test 或者 TRUNCATE test; truncate table 命令将快速删除数据表中的所有记录，但 ...

As I mentioned in another thread, I'm beginning on my first large-scale ETL project. I'll be replacing an existing system that works, fixing a few bugs along the way. I'd like to take the opportunity ...