Question

我有三个表App，Loan和Payment。

我使用以下方法从三个表中选择了所有数据：

SELECT applicant.*, loan.*, payment.* 
FROM (applicant INNER JOIN loan ON applicant.app_trn = loan.app_trn) 
INNER JOIN payment ON loan.loan_reff_id= payment.loan_reff_id ORDER by app_fname

在表格的最底部，我想显示贷款所欠的总金额。

有人可以帮助我，表格如下：

App：app_id，name，address;
Loan：app_id，loan_id，欠款;
Payment：loan_id，付款金额。

我希望能够显示表格底部的欠款总额。

Answer 1

(
   SELECT applicant.*, loan.*, payment.* 
   FROM (applicant INNER JOIN loan ON applicant.app_trn = loan.app_trn) 
   INNER JOIN payment ON loan.loan_reff_id= payment.loan_reff_id ORDER by app_fname
)
union
(    
   SELECT 
       0 as app_id,
       0 as name,
       0 as address,
       0 as loan_id,
       sum(loan amount owed),
       0 as payment amount
   FROM (
       SELECT applicant.*, loan.*, payment.* 
       FROM (applicant INNER JOIN loan ON applicant.app_trn = loan.app_trn) 
       INNER JOIN payment ON loan.loan_reff_id= payment.loan_reff_id ORDER by app_fname
        ) t
)

这个想法是将联合对与聚合函数总和结合使用。

使用mysql在html表的底部显示总和

1 个答案: