这个查询是我尝试过的最复杂的查询。
我的表:(我删除了不相关的数据)

mysql> describe Posts;
+-----------+---------+------+-----+---------+----------------+
| Field     | Type    | Null | Key | Default | Extra          |
+-----------+---------+------+-----+---------+----------------+
| id        | int(11) | NO   | PRI | NULL    | auto_increment |
| Time      | int(11) | YES  | MUL | NULL    |                |
+-----------+---------+------+-----+---------+----------------+

mysql> describe Containers;
+----------+-------------+------+-----+---------+----------------+
| Field    | Type        | Null | Key | Default | Extra          |
+----------+-------------+------+-----+---------+----------------+
| id       | int(11)     | NO   | PRI | NULL    | auto_increment |
| pid      | int(11)     | YES  | MUL | NULL    |                |
| iid      | int(11)     | YES  |     | NULL    |                |
+----------+-------------+------+-----+---------+----------------+

mysql> describe Images;
+--------------+--------------+------+-----+---------+----------------+
| Field        | Type         | Null | Key | Default | Extra          |
+--------------+--------------+------+-----+---------+----------------+
| id           | int(11)      | NO   | PRI | NULL    | auto_increment |
| LocalPath    | varchar(100) | YES  |     | NULL    |                |
| Category     | varchar(20)  | YES  |     | NULL    |                |
+--------------+--------------+------+-----+---------+----------------+

关系:
Posts.id>容器.pid
Containers.iid>图像.id
我想:
获取对应图像所在的所有文章。类别是value1、value2或value3之一。按职位排序。时间。
伪代码:从Images.Category IN('value1','value2,'value3')按Posts.Time DESC.顺序获取所有数据。
尝试:
SELECT * FROM Images I
INNER JOIN Containers C ON C.iid = I.id
INNER JOIN Posts P ON C.pid = P.id
WHERE I.Category IN('value1','value2','value3');

结果:可以,但不能按Posts.Time排序。
SELECT * FROM Posts P
INNER JOIN Containers C ON P.id = C.pid
RIGHT OUTER JOIN Images I ON C.iid = I.id
WHERE I.Category IN('value1','value2','value3')
ORDER BY P.Time DESC;

结果:为不包含Images.Category的帖子获取行。
我希望我的问题格式正确,谢谢你抽出时间。

最佳答案

试试这个:

 SELECT * FROM Images I
 INNER JOIN Containers C ON C.iid = I.id
 INNER JOIN Posts P ON C.pid = P.id
 WHERE I.Category IN('value1','value2','value3')
 ORDER BY P.Time DESC;

09-27 10:16