Question

我的问题类比是这样的：

table: place
id   title            branch
===============================
1    pizza store      california
2    pizza store      manhattan
3    coffee shop      california
4    pizza store      texas
5    cookie store     new york

table: rating
id    place_id     rating
================================
1     1            3.5
2     2            5.0
3     2            4.2
4     2            5.0
5     5            4.0

我使用查询：

 SELECT F.id AS id, F.title AS title, G.rating 
 FROM place F 
 JOIN rating G ON F.id = G.place_id 
 GROUP BY F.title

显示屏将是：

id   title          rating
===========================
1    pizza store    3.5
3    coffee shop    -
5    cookie store   4.0

我想要的是对具有最大值的评级进行排序，在这种情况下，我希望它显示评级为5且id为2的披萨店。是否可以在GROUP BY中插入一些子查询？

提前致谢!!

Answer 1

试

SELECT F.id , F.title, s.Maxrating 
FROM place F 
INNER JOIN (SELECT id,Max(rating) as MaxRating FROM rating  GROUP BY place_id ) s 
ON s.id = F.id

Answer 2

SELECT F.id AS id, F.title AS title, max(G.rating)
FROM place F, rating G
where F.id = G.place_id(+)
group by f.id, f.title

是否可以在GROUP BY中执行子查询？

2 个答案: