mysql - 在 VB.NET 中合并两个 mysql 表并将结果放入 datagrid

Question

我有两个 MySQL 表，

tblloan注册表

LoanID     EMPNumber     Date      Amount     Status
1          1111         2012-10-01  50000        0
2          2222         2012-10-10  10000        1

tblLoanAccount

ID     LoanID     Date     Payment     Interest     Total     Auto     Installment
1         1       2012-10-25  5000         0         5000        0           1
2         1       2012-11-01     0        100         100        1           0
3         1       2012-11-25  5000        100        5100        0           2
4         2       2012-11-25  1500         0         1500        0           1

成员 1111 的输出：

Date          Description     Principle    Interest      Balance
2012-10-25    Installment: 1     5000          0           45000
2012-11-01    Interest             0          100          45100
2012-11-25    Installment: 2     5000         100          40000

我尝试了以下方法，但它显示错误。

SELECT tblLoanAccount.Date, tblLoanAccount.Payment, tblLoanAccount.Interest, 
tblLoanAccount.Total, tblLoanAccount.Auto, tblLoanAccount.Installment FROM " &
"tblLoanAccount WHERE tblLoanAccount.EMPNumber=" & cmbEMPNumber.Text & " AND 
tblLoanAccount.LoanID = '1' AND tblLoanAccount.Total <> 0 ORDER BY tblLoanAccount.ID

错误：

Answer 1

这个错误是因为你还没有加入表。

将此查询用于您的预期答案。您应该加入两个表，然后只有您可以获得输出。

SELECT tblLoanAccount.Date, tblLoanAccount.Payment, tblLoanAccount.Interest,
    tblLoanAccount.Total, tblLoanAccount.Auto, tblLoanAccount.Installment,     
    if(Installment = 0, 'Interest', concat('Installment : ', Installment)) as Description
FROM tblLoanAccount 
JOIN tblloanRegistry ON tblloanRegistry.LoanID = tblLoanAccount.LoanID
WHERE tblloanRegistry.EMPNumber= 1111 
    AND tblLoanAccount.LoanID = 1 
    AND tblLoanAccount.Total <> 0 
ORDER BY tblLoanAccount.ID

您的表架构是在此链接中创建的。请通过它。