How can I give an alias to a table in Oracle?

问题:

Why can't I give an alias to a table in Oracle DB? I tried to write a statement like this one:

select count(id) from users as usr where usr.dept = "SVC";

But Oracle threw me an error. I don't remember having problem when I use something like this in MySQL.

How can I give an alias to a table in Oracle?

回答1:

Oracle doesn't allow as for table aliases, only column aliases. So do:

select count(id)
from users usr
where usr.dept = 'SVC';