如何在雄辩的laravel中用group编写连接查询？

Question

我的数据库中有三个表。

user：存储用户信息。

书：存储每本书的信息

book_reviews：存储每个用户每本书的评论信息（例如总点数）。

我想在Laravel中编写一个查询来检索用户给出的平均总点数最高的书籍。

如何使用Eloquent在Laravel中编写以下SQL查询？

SELECT books.*, AVG(book_reviews.overall_point) AS avg_point
FROM books JOIN
     book_reviews
     ON books.id = book_reviews.book_id
GROUP BY book.id
ORDER BY avg_point DESC

Answer 1

我认为你可以用orderByRaw()方法实现。使用此方法，您可以订购具有平均总点数的书籍

Book::select("books.*")
    ->join("book_reviews br","br.book_id","=","books.id")
    ->orderByRaw("AVG(br.overall_point) desc")
    ->groupBy("books.id")
    ->take(10) # or how many book you want
    ->get();