Mysql s.Staffid=sr.userld上的查询表达式sri.invoiceNo=sri.invoiceNo-internal-JOIN-Staff中出现语法错误（缺少运算符）

当我运行该查询时，我不断收到以下错误：

查询表达式sri.invoiceNo中的语法错误（缺少运算符）= sri.invoiceNo内部连接职员s.Staffid=sr.userld

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在Access中，当有多个联接时，需要使用括号：

"SELECT SalesReturnId, ReturnDate, sr.InvoiceNo, (lastname & ', ' & firstname & ', ' &  MI) as StaffName, TotalAmount, SUM(sri.Quantity) as TotalQuantity FROM SalesReturn sr INNER JOIN SalesReturnItem sri ON sr.InvoiceNo = sri.InvoiceNo INNER JOIN Staff s ON s.StaffId = sr.userID WHERE ReturnDate  BETWEEN '" + startDate.ToString("yyyy-MM-dd") + "' AND '" + endDate.ToString("yyyy-MM-dd") + "' AND sr.InvoiceNo LIKE '%" + txtName.Text + "%' GROUP BY sr.InvoiceNo ORDER BY ReturnDate, sr.InvoiceNo DESC";

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如果这是Access，请将其复制并粘贴到查询设计器中-连接周围缺少一些括号。请添加换行符。

SELECT SalesReturnId, ReturnDate, sr.InvoiceNo, 
(lastname & ', ' & firstname & ', ' &  MI) as StaffName,
TotalAmount, SUM(sri.Quantity) as TotalQuantity 
FROM (SalesReturn sr 
INNER JOIN SalesReturnItem sri ON sr.InvoiceNo = sri.InvoiceNo )
INNER JOIN Staff s ON s.StaffId = sr.userID 
WHERE ReturnDate  BETWEEN '" + startDate.ToString("yyyy-MM-dd") + "' AND '" + endDate.ToString("yyyy-MM-dd") + "' 
AND sr.InvoiceNo LIKE '%" + txtName.Text + "%' 
GROUP BY sr.InvoiceNo 
ORDER BY ReturnDate, sr.InvoiceNo DESC;