我的表格结构:
// posts
+----+----------------------------------------+-----------+
| Id | body | user_id |
+----+----------------------------------------+-----------+
| 1 | content1 | 2 |
| 2 | content2 | 9 |
| 3 | content3 | 6 |
| 4 | content4 | 4 |
| 5 | content5 | 2 |
| 6 | content6 | 8 |
| 7 | content7 | 4 |
| 8 | content8 | 2 |
+----+----------------------------------------+-----------+
// votes
+----+---------+-------+
| id | post_id | value |
+----+---------+-------+
| 1 | 2 | 1 |
| 2 | 3 | -1 |
| 3 | 2 | 1 |
| 4 | 8 | -1 |
| 5 | 1 | 1 |
| 6 | 8 | 1 |
| 7 | 2 | -1 |
| 8 | 8 | -1 |
| 9 | 2 | 1 |
+----+---------+-------+
我需要选择总得分超过 1 的帖子。所以这是预期的输出:
+----+----------------------------------------+-----------+-------------+
| Id | body | user_id | total_votes |
+----+----------------------------------------+-----------+-------------+
| 2 | content2 | 9 | 2 |
+----+----------------------------------------+-----------+-------------+
我该怎么做？
最佳答案
create table qanda
( id int not null,
body varchar(100) not null,
user_id int not null
);
insert qanda values
(1,'a',2),
(2,'a',9),
(3,'a',6),
(4,'a',4),
(5,'a',2),
(6,'a',8),
(7,'a',2),
(8,'a',2);
create table votes
( id int not null,
post_id int not null,
value int not null
);
insert votes values
(1,2,1),
(2,3,-1),
(3,2,1),
(4,8,-1),
(5,1,1),
(6,8,1),
(7,2,-1),
(8,8,-1),
(9,2,1);
查询
select q.id,q.body,q.user_id,sum(v.value) as votes
from qanda q
join votes v
on v.post_id=q.id
group by q.id,q.body,q.user_id
having votes>1;
+----+------+---------+-------+
| id | body | user_id | votes |
+----+------+---------+-------+
| 2 | a | 9 | 2 |
+----+------+---------+-------+
关于mysql - 如何选择获得超过特定票数的帖子？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/39403136/