SQL-запрос для мастер-детали

select m.PersonName, c.CourseName
from   Master m
join   Detail d on d.MasterID = m.ID
join   Course c on c.ID = d.CourseID
where  d.StartDate = (select max(d2.StartDate)
                      from   Detail d2
                      where  d2.MasterID = m.ID
                     )

    Select personname,coursename from details 
    inner join course on course.id = details.courseid 
    inner join master on master.id = details.masterid
    inner join (select max(startdate) ,  courseid,masterid 
    from details group by masterid,courseid ) as tb1
    on tb1.courseid = details.courseid and tb1.masterid = details.masterid