试图在我的 sql 中获得多个内部联接

Question

我将 xampp 与 mysql 一起使用，并且一直在尝试格式化在 4 个单独的表上使用内部联接的查询。内部联接包含表 customer、bankaccounts、has 和 transactions。有 link 从 M:N 到 1:M 的银行账户和客户表，而交易是 linked 到银行账户。我尝试了以下查询：

SELECT t.TransactionID, 
       t.Description, 
       t.Amount, 
       t.isLoan, 
       t.TransactionDate, 
       a.AccountID, 
       a.SortCode, 
       a.Name, 
       a.CreationDate, 
       c.FirstName, 
       c.LastName 
       c.DateofBirth 
FROM transactions AS t 
INNER JOIN bankaccounts AS a

#inner join will create a new table by combining the values selected based on if they satisfy the on condition below

 ON t.TransactionID IN ( SELECT t.TransactionID 
                            FROM transactions 
                            WHERE t.TransactionDate BETWEEN '2021-11-25' AND '2021-12-01'
                          )
AND t.AccountID = a.AccountID
INNER JOIN has ON has.AccountID = a.AccountID  ---- > #multiple inner joins can occur on multiple tables
INNER JOIN customers AS c ON has.CustomerID = c.CustomerID;

然而，目前这只是一个错误。

我需要的是 link 所有表格，同时确保只选择那些特定日期之间的交易。

有什么办法可以解决吗？

Answer 1

您应该将带有子查询的条件移动到 WHERE 子句：

SELECT t.TransactionID, t.Description, t.Amount, t.isLoan, t.TransactionDate, 
       a.AccountID, a.SortCode, a.Name, a.CreationDate, 
       c.FirstName, c.LastName, c.DateofBirth 
FROM transactions AS t 
INNER JOIN bankaccounts AS a ON t.AccountID = a.AccountID
INNER JOIN has ON has.AccountID = a.AccountID
INNER JOIN customers AS c ON has.CustomerID = c.CustomerID
WHERE t.TransactionDate BETWEEN '2021-11-25' AND '2021-12-01';

试图在我的 sql 中获得多个内部联接

Trying to get mutliple inner joins in my sql

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