它以一个查询为输入，准备好查询，然后在输出的结果集中描述每个列。

It takes a query as input, prepares the query and then describes each column in the output result set.

youdao

它以一个查询为输入，准备好查询，然后在输出的结果集中描述每个列。

It takes a query as input, prepares the query and then describes each column in the output result set.

youdao