1，建立測試表
create table `testsign` (
`userid` int(5) default null,
`username` varchar(20) default null,
`signtime` timestamp not null default current_timestamp on update current_timestamp,
`type` int(1) default '0' comment '為0表示簽到資料，1表示簽到日期字典資料'
) engine=innodb default charset=utf8
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-21 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-22 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-23 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-24 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-25 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-26 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-27 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-28 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-29 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-30 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-05-31 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-06-01 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-06-02 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-06-03 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-06-04 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('72164','字典','2017-06-05 00:00:00','1');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吳小雙簽到資料','2017-05-21 00:00:00','0');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吳小雙簽到資料','2017-05-22 00:00:00','0');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吳小雙簽到資料','2017-05-23 00:00:00','0');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吳小雙簽到資料','2017-05-24 00:00:00','0');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吳小雙簽到資料','2017-05-25 00:00:00','0');
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吳小雙簽到資料','2017-05-26 00:00:00','0');
select * from testsign where type=0 and
date_format(signtime,'%y%m%d')>(
select ifnull(max(date_format(signtime,'%y%m%d')),"20170520") from testsign where type=1
and date_format(signtime,'%y%m%d')<=date_add(now(), interval -1 day)
and date_format(signtime,'%y%m%d') not in (
select date_format(signtime,'%y%m%d') from testsign where type=0 and userid=800675
)) and date_format(signtime,'%y%m%d')<='20170605'
and userid=800675
刪掉23號資料，從24號開始算，連續籤三天
4，完事了~~~~~
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