多表的sql联接查询

我有下面的表格结构

客户信息：

  cust_id   cust_name
  1           nikhil
  2           sam

账单信息：

 bill_id  cust_id   bill_amount 
    7         1     10000
    8         1     15000
    9         2     6000
    10        2     4000

付费信息：

   paid_id      cust_id  paid_amount  
      11         1        5000
      12         1        5000
      13         2        5000
      14         2        5000

现在，我的输出应该显示客户的账单总额、该客户支付的总金额和余额

输出 在哪里,， 例如 对于cust_id=2

 total_bill= 10000 + 15000
 total_paid = 5000 + 5000
 balance = total_bill - total_paid

在sql中实现这一点的方便方法是什么？有什么样的查询吗

这是我已经尝试过的

SELECT distinct c.cust_id
    , sum(b.bill_amount) as total_bill
    , SUM(p.paid_amt) AS totalpaid,sum(b.bill_amount) - SUM(p.paid_amt) AS balance 
FROM cust_info c 
INNER JOIN bill_info b ON c.cust_id = b.cust_id 
INNER JOIN paid_info p ON p.cust_id= b.cust_id group by p.cust_id;

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是的，有。In包括WHERE、AS、SUM、DIFF和JOIN。具体语法取决于您使用的数据库是MySQL、Oracle SQL、MSSQL、PostgreSQL等。选择不同的c.cust_id、sumb.bill_amount作为total_bill、SUMp.paid_amount作为totalpaid，sumb.bill_amount-sumb.paid_amount作为c.cust_id上的cust_info c内部联接bill_info b的余额=b.party_id内部联接p.cust_id上的paid_info p=b.cust_id按p.cust_id分组；我试过了是的，有。In包括WHERE、AS、SUM、DIFF和JOIN。具体语法取决于您使用的数据库是MySQL、Oracle SQL、MSSQL、PostgreSQL等。选择不同的c.cust_id、sumb.bill_amount作为total_bill、SUMp.paid_amount作为totalpaid，sumb.bill_amount-sumb.paid_amount作为c.cust_id上的cust_info c内部联接bill_info b的余额=b.party_id内部联接p.cust_id上的paid_info p=b.cust_id按p.cust_id分组；我试过了谢谢，它在字段列表中给出1052列“cust_id”是模糊的谢谢，它在字段列表中给出1052列“cust_id”是模糊的

SELECT distinct c.cust_id
    , sum(b.bill_amount) as total_bill
    , SUM(p.paid_amt) AS totalpaid,sum(b.bill_amount) - SUM(p.paid_amt) AS balance 
FROM cust_info c 
INNER JOIN bill_info b ON c.cust_id = b.cust_id 
INNER JOIN paid_info p ON p.cust_id= b.cust_id group by p.cust_id;

SELECT c.cust_id,
       SUM(b.total_bill),
       SUM(p.total_paid),
       SUM(c.total_bill) - SUM(p.total_paid)
FROM
    cust_info c
    LEFT JOIN bill_info b ON (c.cust_id = b.cust_id)
    LEFT JOIN paid_info p ON (c.cust_id = p.party_id)
GROUP
    BY cust_info.cust_id

SELECT 
    cust_info.cust_id,
    cust_name,
    bill_amount,
    paid_amount,
    bill_amount - paid_amount AS balance
FROM cust_info
INNER JOIN (
    SELECT cust_id, SUM(bill_amount) bill_amount
    FROM bill_info
    GROUP BY cust_id
) bill_info ON bill_info.cust_id = cust_info.cust_id
INNER JOIN (
    SELECT cust_id, SUM(paid_amount) paid_amount
    FROM paid_info
    GROUP BY cust_id
) paid_info ON paid_info.cust_id = cust_info.cust_id

SELECT DISTINCT cust_info.cust_id,
                sum(bill_amount) AS 'total_bill' ,
                sum(paid_amount) AS 'total paid' ,
                (SUM(bill_amount) - sum(paid_amount)) AS balance
FROM cust_info
INNER JOIN bill_info ON cust_info.cust_id = bill_info.cust_id
INNER JOIN paid_info ON cust_info.cust_id = paid_info.cust_id
GROUP BY cust_info.cust_id