t.teacher_id_ as "teacherId"
, t.student_id_ as "studentId"
, t.create_time_ as "createTime"
select
t.teacher_id_ as userId,
count(1) as fansNum
from student_star t
left join sys_user us on t.teacher_id_ = us.id_
left join sys_user ut on t.student_id_ = ut.id_
where us.del_flag_ = 0 and ut.del_flag_ = 0
group by t.teacher_id_
select
t.student_id_ as userId,
count(1) as starTeacherNum
from student_star t
left join sys_user us on t.teacher_id_ = us.id_
left join sys_user ut on t.student_id_ = ut.id_
where us.del_flag_ = 0 and ut.del_flag_ = 0
group by t.student_id_
select
select * from student_star ss where ss.student_id_ = #{studentId}
delete from student_star where student_id_ = #{studentId} and teacher_id_ = #{teacherId}