MySQL将timediff输出转换为日，时，分，秒格式？
要了解MySQL将timediff输出转换为日，时，分和秒格式，您需要在CONCAT()MySQL中使用。
让我们创建一个表。创建表的查询如下：
mysql> create table convertTimeDifferenceDemo -> ( -> Id int NOT NULL AUTO_INCREMENT, -> StartDate datetime, -> EndDate datetime, -> PRIMARY KEY(Id) -> );
使用insert命令在表中插入一些记录。插入记录的查询如下：
mysql> insert into convertTimeDifferenceDemo(StartDate,EndDate) values(date_add(now(),interval -3 hour),date_add(now(),interval 3 hour));
mysql> insert into convertTimeDifferenceDemo(StartDate,EndDate) values(date_add(now(),interval -2 hour),date_add(now(),interval 2 hour));
mysql> insert into convertTimeDifferenceDemo(StartDate,EndDate) values('2018-04-05 12:30:35','2018-05-17 14:30:50');
mysql> insert into convertTimeDifferenceDemo(StartDate,EndDate) values('2017-10-11 11:20:30','2017-12-17 15:21:55');使用select语句显示表中的所有记录。查询如下：
mysql> select *from convertTimeDifferenceDemo;
以下是输出：
+----+---------------------+---------------------+ | Id | StartDate | EndDate | +----+---------------------+---------------------+ | 1 | 2019-01-28 20:55:33 | 2019-01-29 02:55:33 | | 2 | 2019-01-28 21:57:42 | 2019-01-29 01:57:42 | | 3 | 2018-04-05 12:30:35 | 2018-05-17 14:30:50 | | 4 | 2017-10-11 11:20:30 | 2017-12-17 15:21:55 | +----+---------------------+---------------------+ 4 rows in set (0.00 sec)
这是获取timediff输出为日，时，分和秒格式的查询：
mysql> SELECT CONCAT( -> FLOOR(HOUR(TIMEDIFF(StartDate,EndDate)) / 24), ' DAYS ', -> MOD(HOUR(TIMEDIFF(StartDate,EndDate)), 24), ' HOURS ', -> MINUTE(TIMEDIFF(StartDate,EndDate)), ' MINUTES ') AS DESCRIPTION -> FROM convertTimeDifferenceDemo;
以下是输出：
+------------------------------+ | DESCRIPTION | +------------------------------+ | 0 DAYS 6 HOURS 0 MINUTES | | 0 DAYS 4 HOURS 0 MINUTES | | 34 DAYS 22 HOURS 59 MINUTES | | 34 DAYS 22 HOURS 59 MINUTES | +------------------------------+ 4 rows in set, 6 warnings (0.04 sec)