John Mitchell-245523 (12/16/2013)
No need for a cte to do this.
The reason for the CTE is because he wants SubName instead of SubID. Also, if SubName isn't unique, that would mess up the grouping with a straight join.
You can easily handle this by adding SubID to the grouping.
insert Subject
select 'Subject One', 3, 1 union all
select 'Subject One', 3, 1
insert Marks
select 1, 1, 88.9, 22 union all
select 2, 2, 55, 1
select s.SubName, MAX(m.Mark)as diem
from Marks m
join Subject s on s.SubID = m.SubID group by s.SubName, s.SubID
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