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SQL查询：如何获取blog_post.title与最新评论构建自定义sql查询？
select id,title
from blog_post inner join (select object_pk, max(submit_date)
from django_comments
group by object_pk
order by submit_date DESC) as foo
where foo.object_pk=blog_post.id;
如何使用Django model.objects.get功能我得到同样的结果？我如何使用django为此编写自定义查询？有没有像
model.objects.getwithsqlquery('''select id,title
from blog_post inner join (select object_pk, max(submit_date)
from django_comments
group by object_pk
order by submit_date DESC) as foo
where foo.object_pk=blog_post.id;''')
MySQL表什么是：
mysql> describe blog_post;
+----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+----------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| user_id | int(11) | NO | MUL | NULL | |
| title | varchar(100) | NO | | NULL | |
| content | longtext | NO | | NULL | |
| created | date | NO | | NULL | |
| modified | date | NO | | NULL | |
+----------+--------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)
mysql> describe django_comments;
+-----------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| content_type_id | int(11) | NO | MUL | NULL | |
| object_pk | longtext | NO | | NULL | |
| site_id | int(11) | NO | MUL | NULL | |
| user_id | int(11) | YES | MUL | NULL | |
| user_name | varchar(50) | NO | | NULL | |
| user_email | varchar(75) | NO | | NULL | |
| user_url | varchar(200) | NO | | NULL | |
| comment | longtext | NO | | NULL | |
| submit_date | datetime | NO | | NULL | |
| ip_address | char(15) | YES | | NULL | |
| is_public | tinyint(1) | NO | | NULL | |
| is_removed | tinyint(1) | NO | | NULL | |
+-----------------+--------------+------+-----+---------+----------------+
13 rows in set (0.00 sec)