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sqlÓï¾äÎÊÌâ - MS-SQL Server / Ó¦ÓÃʵÀý

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 s_c(sid,cid,score)
sidѧºÅ
cid ¿Î³ÌºÅ
score³É¼¨
SQL code:
update s set s.score=1.05*score
from s_c s
join
(select cid,avg(score) as avgscore
from s_c
Group by cid) c on s.cid=c.cid and s.score<c.avgscore


SQL code:
create table s_c(sid int,cid int,score int)
insert s_c
select 1,1,40 union all
select 2,1,50 union all
select 3,1,60 union all
select 1,2,50 union all
select 2,2,60 union all
select 3,2,70

select * from s_c t
where score<(select avg(score) from s_c where cid=t.cid group by cid)
/*
sid cid score
----------- ----------- -----------
1 1 40
1 2 50

£¨ËùÓ°ÏìµÄÐÐÊýΪ 2 ÐУ©*/
update t set score = score*1.05
from s_c t
where score<(select avg(score) from s_c where cid=t.cid group by cid)
select * from s_c

/*
sid cid score
----------- ----------- -----------
1 1 42
2 1 50
3 1 60
1 2 52
2 2 60
3 2 70

£¨ËùÓ°ÏìµÄÐÐÊýΪ 6 ÐУ©
*/


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