SQL语法困惑(Natural Join)

Question

下面是代码

postgres=# SELECT title,name,borrower.address WHERE library_branch NATURAL JOIN
book NATURAL JOIN book_loans NATURAL JOIN borrow WHERE library_branch.branchname
='Sharpstown' AND dateOut='12/10/2014';
ERROR:  syntax error at or near "NATURAL"
LINE 1: ... title,name,borrower.address WHERE library_branch NATURAL JO...
                                                         ^
postgres=#

不确定为什么会出现错误。我以为我正确地进行了自然连接。有什么建议吗？

Answer 1

你有一个 where 关键字，from 应该去哪里:

SELECT       title, name, borrower.address 
FROM         library_branch -- There's a WHERE here in the OP
NATURAL JOIN book 
NATURAL JOIN book_loans 
NATURAL JOIN borrow 
WHERE        library_branch.branchname = 'Sharpstown' AND 
             dateOut = '12/10/2014';