Question

我正在使用MS Access 2013。

我正在尝试从Salesperson表中选择数字和名称。来自Customers表的编号，名称和邮政编码以及CarSale表中过去一个月内的所有信息以及销售员编号的订单。

我想出了以下内容

SELECT CS.carNo, CS.dateOfSale, SA.salespersonNo, SA.name AS SalesName, 
       CU.customerNo, CU.name AS CustName, CU.postCode  
FROM CarSale AS CS, Car AS C, Salesperson AS SA, Customer AS CU 
WHERE CS.carNo = C.carNo AND CS.salespersonNo = SA.salespersonNo 
AND CS.customerNo = CU.customerNo AND dateOfSale BETWEEN #01/09/2016#  
AND #02/09/2016# 
ORDER BY CS.salespersonNo;

然而，正如你所看到的，这很丑陋！我做了一些研究，发现我应该使用＆＃34; JOINS＆＃34;所以我继续把它们包括在内，这就是我的问题所在。

将JOINS插入查询后，我得到的内容如下：

SELECT CS.carNo, CS.dateOfSale, SA.salespersonNo, SA.name AS SalesName,
       CU.customerNo, CU.name AS CustName, CU.postCode 
FROM CarSale AS CS 
JOIN Car AS C ON CS.carNo = C.carNo 
JOIN Salesperson AS SA on CS.salespersonNo = SA.salespersonNo 
JOIN Customer AS CU ON CS.customerNo = CU.customerNo 
WHERE cs.dateOfSale BETWEEN #01/09/2016# AND #02/09/2016# 
ORDER BY CS.salespersonNo;

以下是表格：

**CarSale**
carNo    salespersonNo    customerNo    dateOfSale
-------------------------------------------------------


**Salesperson**
salespersonNo    name    contactNo    monthlySalary  centreNo
--------------------------------------------------------------


**Customer** 
customerNo    name    contactNo   postCode
---------------------------------------------

我得到的错误是＆＃34; FROM子句中的语法错误。＆＃34;

Answer 1

我认为你已经离开了，但是你的if (Workbook.SharedStrings.si[Convert.ToInt32(_value)].t != null) { Text = Workbook.SharedStrings.si[Convert.ToInt32(_value)].t; } else if (Workbook.SharedStrings.si[Convert.ToInt32(_value)].ns != null) { for (int i = 0; i < Workbook.SharedStrings.si[Convert.ToInt32(_value)].ns.Length; i++) { Text += Workbook.SharedStrings.si[Convert.ToInt32(_value)].ns[i].t; } }有一些不可思议的东西 - 你加入了汽车＆＃39;但这不是你的一个表。表之间发生JOIN，ON指定相等的字段（JOIN JOIN ON}。考虑到这一点：

SELECT s.salespersonNo, s.name, c.customerNo, cs.carNo, 
       cs.dateofsale, c.name, c.postCode
FROM salesperson s
INNER JOIN carsale cs
ON cs.salespersonNo = s.salespersonNo
INNER JOIN customer c
ON cs.customerNo = c.customerNo
WHERE cs.dateOfSale BETWEEN #01/09/2016# AND #02/09/2016# 
ORDER BY CS.salespersonNo;

请注意，您的WHERE和ORDER BY未更改，我在测试运行中只使用了不同的别名。主要区别在于JOIN - 我从销售人员加入CarSales ON salespersonNo，然后从CarSales加入customerNo，类似于您已有的。

Answer 2

语法错误是因为对于多个JOIN，您需要在每对JOIN周围使用括号。

使用查询设计器要容易得多，它会自动执行这些操作。

SELECT CS.carNo, CS.dateOfSale, SA.salespersonNo, SA.name AS SalesName,
       CU.customerNo, CU.name AS CustName, CU.postCode 
FROM (((CarSale AS CS 
  INNER JOIN Car AS C ON CS.carNo = C.carNo) 
  INNER JOIN Salesperson AS SA on CS.salespersonNo = SA.salespersonNo) 
  INNER JOIN Customer AS CU ON CS.customerNo = CU.customerNo) 
WHERE cs.dateOfSale BETWEEN #01/09/2016# AND #02/09/2016# 
ORDER BY CS.salespersonNo;

正如Stidgeon所写，如果这些都是您需要的字段，则可以省略Car的加入。

SQL：从多个表中选择多个列

2 个答案: