MYSQL的time型別值進行統計

1.實現功能場景：統計一天中工作時間

2.建表：

create table `loadmovement` (

`uuid` varchar (96),
`criminalid` varchar (96),
`movementdate` datetime ,
`exittime` varchar (60),
`returntime` varchar (60),
`nextdateindicator` double ,
`movedays` double ,
`modifytime` datetime ,
`createtime` datetime ,
`valid` double 
); insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c616bf0129c6178c3a0003','402880e928c7ca190128c7dd863d0005','2010-07-12 17:58:38','11:15:00','00:30:00','1','2','2010-07-12 19:05:44','2010-07-12 17:58:38','0');
insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c97a710129c9870e280003','402880e928c7ca190128c7dd863d0005','2010-07-13 09:59:18','01:00:00','00:30:00','1','2','2010-07-13 10:14:02','2010-07-13 09:59:18','0');
insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c97a710129c9870e280004','402880e928c7ca190128c7dd863d0005','2010-07-13 09:59:18','11:30:00','01:00:00','1','2','2010-07-13 10:04:12','2010-07-13 09:59:18','0');
insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c97a710129c9870e280005','402880e928c7ca190128c7dd863d0005','2010-07-13 09:59:18','11:00:00','00:00:00','1','1','2010-07-13 10:12:30','2010-07-13 09:59:18','0');
insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c97a710129c9870e280006','402880e928c7ca190128c7dd863d0005','2010-07-13 09:59:18','11:45:00','01:00:00','1','3','2010-07-13 10:09:27','2010-07-13 09:59:18','0');
insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c97a710129c99b1b56000d','402880e928c7ca190128c7dd863d0005','2010-07-13 10:21:12','11:30:00','00:45:00','1','2','2010-07-13 10:22:08','2010-07-13 10:21:12','0');
insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c97a710129c9a42378000f','402880e928c7ca190128c7dd863d0005','2010-07-13 10:31:04','11:30:00','00:15:00','1','4','2010-07-13 10:31:04','2010-07-13 10:31:04','1');
insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c97a710129c9a423780010','402880e928c7ca190128c7dd863d0005','2010-07-13 10:31:04','11:30:00','01:00:00','1','2','2010-07-13 10:31:04','2010-07-13 10:31:04','1');
insert into `loadmovement` (`uuid`, `criminalid`, `movementdate`, `exittime`, `returntime`, `nextdateindicator`, `movedays`, `modifytime`, `createtime`, `valid`) values('402880e929c97a710129c9a423780011','402880e928c7ca190128c7dd863d0005','2010-07-13 10:31:04','11:00:00','00:45:00','1','1','2010-07-13 10:31:04','2010-07-13 10:31:04','1');

3.查詢：

select movedays,  time_format(

sec_to_time(sum(case when nextdateindicator=1
then
time_to_sec(returntime)-time_to_sec(exittime)+time_to_sec('24:00:00')
else
time_to_sec(returntime)-time_to_sec(exittime)
end)),'%t') as calctime, returntime,exittime
from loadmovement where criminalid='402880e928c7ca190128c7dd863d0005'
group by movedays

4.說明time_format非常重要，本人就是缺少了這個函式，致使在前端的顯示為(1970/1/1),若要顯示為(hh:mm:ss)格式，須加上此函式

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