Detailed explanation of how MYSQL implements the function of continuously signing in and starting from scratch for one day (picture)

This article mainly introduces MYSQL to realize the continuous sign-in function and start from scratch after one day. It is very good and has reference value. Friends who need it can refer to it

1 , create test table

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 '为0表示签到数据，1表示签到日期字典数据' 
) ENGINE=InnoDB DEFAULT CHARSET=utf8

2, insert test data, check-in time is from 5.21 to 6.5, you can write live, but you need to write stored procedure, I compare Lazy, the focus should be on the code to get the sign-in data, which is the third point, haha

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','吴小双签到数据','2017-05-21 00:00:00','0'); 
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吴小双签到数据','2017-05-22 00:00:00','0'); 
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吴小双签到数据','2017-05-23 00:00:00','0'); 
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吴小双签到数据','2017-05-24 00:00:00','0'); 
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吴小双签到数据','2017-05-25 00:00:00','0'); 
insert into `testsign` (`userid`, `username`, `signtime`, `type`) values('800675','吴小双签到数据','2017-05-26 00:00:00','0');

3,QueryContinuous sign-in data

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,&#39;%Y%m%d&#39;)<=DATE_ADD(NOW(), INTERVAL -1 DAY) 
 AND DATE_FORMAT(signtime,&#39;%Y%m%d&#39;) NOT IN ( 
    SELECT DATE_FORMAT(signtime,&#39;%Y%m%d&#39;) FROM testsign WHERE TYPE=0 AND userid=800675 
    ) 
 ) 
 AND DATE_FORMAT(signtime,&#39;%Y%m%d&#39;)<=&#39;20170605&#39; 
 AND userid=800675

Unbroken data

Delete the data on the 23rd, count from the 24th, and sign for three consecutive days

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