如何在 Access 中创建子查询

Question

我对如何正确执行 Microsoft Access 子查询感到很困惑。我有一个假设，我应该在其中创建一个，但我终其一生都无法弄清楚。问题来了：

第三季度。获取订购书籍的所有第二作者的姓氏和名字。在书名旁边印上这些名字。还显示这些标题中的每一个的总销售量。总销售量是订单行中的书籍数量乘以它们的价格，并为同一作者的所有订单相加。按销售总额的降序排列结果（提示：使用 SUM 函数将乘法相加，并使用 GROUP BY 对每个作者和标题进行这些加法）。

我已经弄清楚了这两个部分的 SQL（或者我认为是这样）。这是我到目前为止所得到的：

打印标题、姓氏和名字：

SELECT Book.Title, Author.LastName, Author.FirstName<br>
FROM Wrote, Author, Book, OrderLine<br>
WHERE Wrote.AuthorRank = 2<br>
AND Wrote.AuthorId = Author.AuthorID<br>
AND Book.ISBN = Wrote.ISBN<br>
AND OrderLine.ISBN = Book.ISBN;

计算总销售量：

SELECT SUM(Quantity * Price) AS TotalAmountSold<br>
FROM Book, OrderLine<br>
GROUP BY Title;

我正在努力弄清楚如何将这些组合在一起以实现问题对我的要求。有什么提示可以帮助我理解如何做这样的事情吗？提前致谢。

Answer 1

构建并保存查询 1：

SELECT OrderLine.ISBN, Title, Sum([Quantity]*[Price]) AS TotalAmountSold
FROM OrderLine INNER JOIN Book ON OrderLine.ISBN = Book.ISBN
GROUP BY OrderLine.ISBN, Title;

构建查询 2：

SELECT Author.AuthorID, FirstName, LastName, Title, TotalAmountSold
FROM (Author INNER JOIN Wrote ON Author.AuthorID = Wrote.AuthorID) 
INNER JOIN Query1 ON Wrote.ISBN = Query1.ISBN
WHERE (((Wrote.AuthorRank)=2))
ORDER BY TotalAmountSold DESC;

如果您想要一个一体式 SQL，请将 Query1 SQL 复制/粘贴到 Query2 中，结果如下：

SELECT Author.AuthorID, FirstName, LastName, Title, TotalAmountSold
FROM (Author INNER JOIN Wrote ON Author.AuthorID = Wrote.AuthorID) 
INNER JOIN 
     (SELECT OrderLine.ISBN, Title, Sum([Quantity]*[Price]) AS TotalAmountSold
      FROM OrderLine INNER JOIN Book ON OrderLine.ISBN = Book.ISBN
      GROUP BY OrderLine.ISBN, Title) AS Query1 
ON Wrote.ISBN = Query1.ISBN
WHERE (((Wrote.AuthorRank)=2))
ORDER BY TotalAmountSold DESC;

保存 Query2 并删除 Query1。