Question

我需要在SQL中进行查询才能显示畅销书。为此，我需要做一个内连接，并在我进行内连接后遇到问题。这是我的代码：

CREATE VIEW mostpopularbookssold AS 
SELECT     Count(orders.book_id) AS numberofbookssold , 
           Top(1) books.[Name] 
FROM       orders 
INNER JOIN books 
ON         books.id=orders.book_id 
GROUP BY   books.[Name] 
select * 
FROM   mostpopularbookssold

Answer 1

在TOP(1)之后，SELECT应放在查询的开头。此外，您必须通过出售的书籍进行订购：

CREATE VIEW MostPopularBooksSold
AS
SELECT TOP(1)
    COUNT(Orders.Book_ID) AS NumberOfBooksSold
    , Books.[Name] 
FROM [the database name].[schema name].[Orders] AS Orders
INNER JOIN [the database name].[schema name].[Books] AS Books
    ON Books.ID = Orders.Book_ID
GROUP BY Books.[Name]
ORDER BY COUNT(Orders.Book_ID) DESC

您应该使用数据库的名称替换数据库名称，您已在其中创建了相应的表，并且已将schema name替换为您拥有的模式名称创建了相应的表（如果您没有明确说明模式名称，通常这是dbo。）

在SQL中进行分组和排序

1 个答案: