Question

帮助，我是SQL的新手，也是Stack Overflow的新手！

我收到一个“语法错误”，这似乎只发生在第二个左连接（没有它，代码运行正常）。这是我的代码，由Access 2010编译：

SELECT      Billings.[CustomerNumber], 
            Billings.[Customer Name], 
            Billings.[SOP Number], 
            Billings.[Item Number], 
            Sum (Billings.[Extended Price]) AS ['Revenue'], 
            Sum (Billings.QTY) AS ['Quantity']
FROM        [Product Codes]         AS Codes
LEFT JOIN   Billings                ON Codes.[Product Code] = Billings.[Item Number]
LEFT JOIN   [All Rep Assignments]   ON Billings.CustomerNumber = [All Rep Assignments].[Account Number]
GROUP BY    Billings.[CustomerNumber], 
            Billings.[Customer Name], 
            Billings.[SOP Number], 
            Billings.[Item Number]

Answer 1

如果显示的SQL来自使用SQL视图的Access查询构建器，请注意Access对空白区域敏感。确保您的线条以空格结尾。（我注意到最后没有分号，这在该视图中是必需的。）

如果您的代码来自其他地方，例如VBA模块，则使用SQL视图将该SQL移动到Access查询构建器并从那里进行故障排除。（最后用分号。）更多信息见here。

Answer 2

多个连接时需要括号（每个连接1个）

SQL multiple join statement

SELECT      Billings.[CustomerNumber], 
            Billings.[Customer Name], 
            Billings.[SOP Number], 
            Billings.[Item Number], 
            Sum (Billings.[Extended Price]) AS ['Revenue'], 
            Sum (Billings.QTY) AS ['Quantity']
FROM        (([Product Codes]         AS Codes
LEFT JOIN   Billings                
ON Codes.[Product Code] = Billings.[Item Number])
LEFT JOIN   [All Rep Assignments]   
ON Billings.CustomerNumber = [All Rep Assignments].[Account Number])
GROUP BY    Billings.[CustomerNumber], 
            Billings.[Customer Name], 
            Billings.[SOP Number], 
            Billings.[Item Number]

需要在SQL中调试Left Join

2 个答案: