How to use Digital Auxiliary Table to record data in mysql
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Structure:
Create table user_baseinfo (
Userid bigint not null primary key
Createtime timestamp
);
Create table user_daily_log (
Userid bigint
Dt date
Somevalue int
Primary key (userid,dt)
);
The test data are as follows:
INSERT INTO `userid` baseinfo` (`userid`, `createtime`) VALUES (100heroine 2017-09-18 0000purve00')
INSERT INTO `userid` baseinfo` (`userid`, `createtime`) VALUES (200Jing Jing 2017-09-23 00 VALUES 00')
INSERT INTO `user_daily_ log` (`userid`, `dt`, `somatoe`) VALUES
INSERT INTO `user_daily_ log` (`userid`, `dt`, `somatoe`) VALUES
INSERT INTO `user_daily_ log` (`userid`, `dt`, `somatoe`) VALUES
INSERT INTO `user_daily_ log` (`userid`, `dt`, `somatoe`) VALUES
INSERT INTO `user_daily_ log` (`userid`, `dt`, `somatoe`) VALUES
Today's date: 2017-09-26
User_baseinfo is a table of basic user information, including user ID and creation time.
User_daily_log is a daily statistical table of users, which requires users to have a statistical data every day since it was created, even if the statistical value is 0.
Problem: the program has bug, and many users with a statistical value of 0 do not create related records. Now we need to re-record this part of the data.
Resolve:
Make up the relevant data
Insert into user_daily_log (userid,dt,somevalue)
Select t1.useriddiary t1.ctimejin0 from (
Select u.userid.u.createtimekeeper interval (id-1) day ctime from
User_baseinfo u inner join nums n on (datediff (now (), u.createtime) > = n.id)
) T1
Left join user_daily_log log on (t1.userid=log.userid and t1.ctime=log.dt)
Where log.userid is null
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