用SUM時間

Question

MYSQL選擇查詢我已經在MySQL下表：

ship_id| start time | plus time | 
---------------------------------------------- 
shp_01 | 14:00:00 | 00:30:00 | 
shp_02 | 02:00:00 | 00:30:00 | 

我要總結的開始時間和加上時間。 我需要以下的輸出：

shp_01 | shp_02 | 
14:30:00 | 02:30:00 | 

最終的結果，我想只有一個最大值

shp_01 | 
14:30:00 | 

那麼，怎樣才能通過使用只有一個查詢最終的結果？

Answer 1

使用HAVING子句指定你的病情，當你需要

Answer 2

DROP TABLE my_table; 

CREATE TABLE my_table 
(ship_id INT NOT NULL AUTO_INCREMENT PRIMARY KEY 
,start_time TIME NOT NULL 
,plus_time TIME NOT NULL 
); 

INSERT INTO my_table VALUES 
(1 ,'14:00:00','00:30:00'), 
(2 ,'02:00:00','00:30:00'); 

SELECT * FROM my_table; 
+---------+------------+-----------+ 
| ship_id | start_time | plus_time | 
+---------+------------+-----------+ 
|  1 | 14:00:00 | 00:30:00 | 
|  2 | 02:00:00 | 00:30:00 | 
+---------+------------+-----------+ 

SELECT *, ADDTIME(start_time,plus_time) total FROM my_table ORDER BY total DESC LIMIT 1; 
+---------+------------+-----------+----------+ 
| ship_id | start_time | plus_time | total | 
+---------+------------+-----------+----------+ 
|  1 | 14:00:00 | 00:30:00 | 14:30:00 | 
+---------+------------+-----------+----------+