如何以这种方式加入3个表

Question

我有3张桌子：

我想要一个显示Movies.title，SUM（Bookings.price）和COUNT（BookingId）的结果表。

我尝试了下面的代码，但不断收到错误：

  

专栏＆＃39; Movies.Title＆＃39;在选择列表中无效，因为它不包含在聚合函数或GROUP BY子句中。

SELECT Movies.Title, SUM(Bookings.Price) ASnewPrice, COUNT(Bookings.BookingId) AS Quantity 
FROM ((Orders
INNER JOIN Bookings ON Orders.BookingId = Bookings.BookingId)
INNER JOIN Movies ON Movies.MovieId = Bookings.MovieId)
WHERE UserId = @UserId AND Completed = @Completed 
ORDER BY Bookings.BookingId

Answer 1

你可以试试这个：

SELECT 
  Movies.Title, SUM(Bookings.Price) AS newPrice,COUNT(Bookings.BookingId) AS Quantity 
FROM Orders 
INNER JOIN Bookings ON (Orders.BookingId = Bookings.BookingId)
INNER JOIN Movies ON (Movies.MovieId = Bookings.MovieId)
WHERE UserId = @UserId AND Completed = @Completed 
GROUP BY Movies.Title
ORDER BY Bookings.BookingId