高手帮看下，新手不会写SQL解决办法

高手帮看下，新手不会写SQL
SELECT   A.ID,A.Name,
            (SELECT   COUNT(B.ID)   FROM   Doc_List   B   WHERE   B.Doctype   =   A.ID   AND   B.PrjID=2)   As   DocCount
FROM   Doc_Type   A  
Where   (SELECT   COUNT(B.ID)   As   DocCount   FROM   Doc_List   B   WHERE   B.Doctype   =   A.ID   AND   B.PrjID=2)> 0
ORDER   BY   A.ID

这据SQL能执行，但感觉是不是重复了，效率低下，高手指教下应该怎么写！谢谢！

[解决办法]
select
A.ID,A.Name,COUNT(B.ID) as DocCount
from
Doc_Type A,
Doc_List B
where
B.Doctype = A.ID and B.PrjID=2
group by
A.ID,A.Name