Question

我正在使用MS Access 2007.每当我键入Left Join时，我都会收到一条错误消息，指出不支持Left Join。这是SQL

TRANSFORM Count([Letter Status].Customer_ID) AS CountOfCustomer_ID 
SELECT Switch(
            [Race_1]=1,"White",
            [Race_1]=2,"Black",
            [Race_1]=3,"Asian",
            [Race_1]=4,"Hispanic/Latino",
            [Race_1]=5,"American Indian/ Alaskan Native",
            [Race_1]=6,"Native Hawaiian or Pacific Islander",
            [Race_1]=7,"Multiracial",
            [Race_1]=8,"Other",
            [Race_1]=9,"Unknown"
        ) AS Race 
FROM Demographics 
    INNER JOIN (
        [Status] 
        INNER JOIN 
            Research 
                ON [Status].Customer_ID = Research.Customer_ID
        ) 
        ON (Demographics.ID = [Letter Status].Customer_ID) 
        AND (Demographics.ID = Research.Customer_ID) 
WHERE ((([Status].Count)=1)) 
GROUP BY [Status].Count, Demographics.Race_1 
ORDER BY Research.Store_site 
PIVOT Research.Store_site In (1,2,3,4,5,6,7,8,9,10);

有人可以使用上面的代码向我展示左边连接的位置，以便允许每个Race的行显示在表格中吗？另外，您能否告诉我如何在此代码中将Null值替换为0？我试图实施NZ（），但一直没有成功。

请帮忙。

Answer 1

仔细查看你的FROM子句。

FROM Demographics 
    INNER JOIN (
        [Status] 
        INNER JOIN 
            Research 
                ON [Status].Customer_ID = Research.Customer_ID
        ) 
        ON (Demographics.ID = [Letter Status].Customer_ID) 
        AND (Demographics.ID = Research.Customer_ID)

你有一个ON条件，它引用[Letter Status]，但你的源表中没有[Letter Status] ....你有一个名为[Status]。

首先在查询设计器中构建JOIN，这样您就知道您将使用Access接受的SQL。

简化这个事情，直到你把JOIN整理出来。在JOIN工作之后，摆脱Switch，TRANSFORM，PIVOT和GROUP BY。

SQL - 左连接不使用switch语句

1 个答案: