select manga_source_id, manga_episode_name, manga_episode_number
from manga_chapter
+-----------------+--------------------------------------+----------------------+
| manga_source_id | manga_episode_name | manga_episode_number |
+-----------------+--------------------------------------+----------------------+
| 5 | A Method to Make the World Gentle 1 | 1 |
| 5 | A Method to Make the World Gentle 2 | 2 |
| 5 | A Method to Make the World Gentle 3 | 3 |
| 5 | A Method to Make the World Gentle 5 | 5 |
| 5 | A Method to Make the World Gentle 6 | 6 |
| 5 | A Method to Make the World Gentle 7 | 7 |
| 5 | A Method to Make the World Gentle 8 | 8 |
| 5 | A Method to Make the World Gentle 9 | 9 |
| 5 | A Method to Make the World Gentle 10 | 10 |
| 5 | A Method to Make the World Gentle 11 | 11 |
| 5 | A Method to Make the World Gentle 12 | 12 |
| 5 | A Method to Make the World Gentle 13 | 13 |
| 5 | A Method to Make the World Gentle 14 | 14 |
| 5 | A Method to Make the World Gentle 15 | 15 |
| 5 | A Method to Make the World Gentle 16 | 16 |
| 5 | A Method to Make the World Gentle 17 | 17 |
| 5 | A Method to Make the World Gentle 18 | 18 |
| 5 | A Method to Make the World Gentle 19 | 19 |
| 5 | A Method to Make the World Gentle 20 | 20 |
| 5 | A Method to Make the World Gentle 21 | 21 |
| 5 | A Method to Make the World Gentle 22 | 22 |
| 5 | A Method to Make the World Gentle 23 | 23 |
| 5 | A Method to Make the World Gentle 24 | 24 |
| 5 | A Method to Make the World Gentle 25 | 25 |
| 5 | A Method to Make the World Gentle 26 | 26 |
+-----------------+--------------------------------------+----------------------+
25 rows in set (0.00 sec)
select manga_source_id, manga_episode_name, manga_episode_number
from manga_chapter
GROUP by manga_source_id
ORDER BY manga_episode_number DESC
+-----------------+-------------------------------------+----------------------+
| manga_source_id | manga_episode_name | manga_episode_number |
+-----------------+-------------------------------------+----------------------+
| 5 | A Method to Make the World Gentle 1 | 1 |
+-----------------+-------------------------------------+----------------------+
我试图获得最后一个manga_episode_number 让世界变得温和的方法26 然而它不起作用,即使我通过manga_episode_number DESC指定ORDER
如何使用GROUP by
实现绘制最后一条记录谢谢!
答案 0 :(得分:0)
使用子查询获取最大剧集,然后加入以获取其余列:
select c.*
from manga_chapter c join
(select manga_source_id, max(manga_episode_number) as maxmen
from manga_chapter
group by manga_source_id
) cc
on c.manga_source_id = cc.manga_source_id and
c.manga_episode_number = cc.maxmen;
答案 1 :(得分:0)
由于您需要查询的漫画名称,并且您有其他ID,这是您想要的查询:
SELECT mc.manga_source_id,
mc.manga_episode_name,
mc.manga_episode_number
FROM manga_chapter mc INNER JOIN
( SELECT manga_source_id, max(manga_episode_number) mx
FROM manga_chapter
GROUP BY manga_source_id ) mc_max
ON (mc.manga_source_id = mc_max.manga_source_id)
AND mc.manga_episode_number = mc_max.mx)