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 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 and t.student_id_ = #{studentId} and t.teacher_id_ = #{teacherId} select * from student_star ss where ss.student_id_ = #{studentId}