表结构为

表名 notice  游戏类型  n_type(斗地主1、斗地主2、斗地主3)   资讯  n_news (新闻、活动、公告)

时间 n_time

需求

查询notice表中游戏类型为“斗地主1”的最新一条新闻、最新一条活动、最新一则公告，只能使用一条sql语句

思路

查询分为三个部分，每个部分都是一个子查询，然后使用UNION ALL将这三个子查询的结果合并在一起

代码

SELECT * FROM (SELECT * FROM noticeWHERE n_type = '斗地主1' AND n_news = '活动'ORDER BY n_time DESCLIMIT 1
) AS activity
UNION ALL
SELECT * FROM (SELECT * FROM noticeWHERE n_type = '斗地主1' AND n_news = '新闻'ORDER BY n_time DESCLIMIT 1
) AS news
UNION ALL
SELECT * FROM (SELECT * FROM noticeWHERE n_type = '斗地主1' AND n_news = '公告'ORDER BY n_time DESCLIMIT 1
) AS notice;