mysql - 谁是在同一分行同时拥有账户和贷款的客户？

Question

我有这些表:

我想知道:在同一分行同时拥有账户和贷款的客户是谁？

我尝试了如下两段代码:

select distinct depositor.customer_name, account.branch_name
from (borrower inner join loan on borrower.loan_number=loan.loan_number) 
inner join 
( depositor inner join account on depositor.account_number=account.account_number ) 
on (account.branch_name=loan.branch_name and borrower.customer_name=depostior.customer_name);

还有这个:

select account.branch_name, depositor.customer branch_name
from account, depostior
where depositor.customer_name, account.branch_name
in ( borrower inner join loan on borrower.loan_number=loan.loan_number );

在最新的一个中，我以某种方式尝试了嵌套查询，但没有成功。

那么我该如何解决这个问题呢？谢谢

Answer 1

select distinct d.customer_name, a.branch_name
from depositor d,  account a, borrower b, loan l
where 
d.account_number = a.account_number
and d.customer_name = b.customer_name
and b.loan_number = l.loan_number
and l.branch_name = a.branch_name

用 INNER JOIN 语法重写

SELECT DISTINCT d.customer_name, a.branch_name
FROM depositor d
INNER JOIN account a ON d.account_number = a.account_number
INNER JOIN borrower b ON d.customer_name = b.customer_name
INNER JOIN loan l ON b.loan_number = l.loan_number
       AND l.branch_name = a.branch_name