select userId, result, max(dailyTime),studentbase.sclassId,collegeId,majorId
from dailycard, studentbase, collegemajorclass
where
dailycard.userId = studentbase.studentId and
studentbase.sclassId=collegemajorclass.sclassId
and DATE_FORMAT(dailyTime,'%Y-%m-%d') = '2022-06-04'
and collegemajorclass.collegeId=6
group by dailycard.userId;
MYSQL查询不用用户某一天的最新记录