更新表不使用遊標

Question

我有這樣

alt text http://img252.imageshack.us/img252/8518/data.png

我想標識的基礎上更新MINP，MAXP和agvP列中的數據。我期望的結果是;

alt text http://img20.imageshack.us/img20/2029/updatedu.png

請幫助。

Answer 1

嘗試類似：

update mt 
set minp = a.minp, 
maxp = a.maxp, 
avgp = a.avgp 
from mytable mt 
join 
(select id, min(price) as minp, max(price) as maxp, avg(price) as avgp 
from mytable group by id) a on a.id = mt.id