主查询详细信息

Question

主表包含ID和PersonName。
课程表包含ID，CourseName。
详细信息表包含ID，MasterID，CourseID，起始日期，结束日期

我要创建报告，显示人（PERSONNAME），他们把唯一的最后一道菜的名单（所以每个人只列出一次）：

PERSONNAME - CourseName - 起始日期 - 结束日期

Answer 1

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 
        ) 

Answer 2

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