Mysql 从结果集中选择TOP 1

我想检索使用Union连接的查询结果集的前1个值

SELECT TOP 1 * FROM
(
    SELECT paused_time as end_time
        FROM production_time
        WHERE created_time = curdate()
    UNION 
    SELECT resumed_time as end_time
        FROM pause_timer
        WHERE created_time = curdate()
    UNION
    SELECT end_time as end_time
        FROM timer_idle
        WHERE created_time = curdate()
) as end_time
ORDER BY end_time DESC 

---

但是没有得到预期的结果。

据我所知，MySQL中没有

TOP

关键字。您需要的是

限制

：

SELECT * FROM
(
    SELECT paused_time as end_time FROM production_time WHERE created_time = curdate()
    UNION 
    SELECT resumed_time as end_time FROM  pause_timer WHERE created_time = curdate()
    UNION
    SELECT end_time as end_time FROM  timer_idle WHERE created_time = curdate()
) as end_time
ORDER BY end_time DESC 
LIMIT 1

---

MySQL中的

TOP 1

更像是

ORDER BY。。。限制0，1这真的有效吗：
created\u time=curdate（）
？