sql="SELECT DISTINCT c.*,round(AVG(d.sort1)) avgsort1,round(AVG(d.avgprice)) avgprice
FROM `member_company` `c`,`yp_dp` `d`,`yp_relation` `r`
WHERE c.userid = d.userid = r.userid
GROUP BY c.userid ORDER BY avgprice desc"上面是需要修改的语句,我想把 GROUP BY c.userid移到 from 之前计算,例如下:
sql="SELECT DISTINCT c.*, avgsort1 (select round(AVG(d.sort1)) from `member_company` `c`,`yp_dp` `d` where c.userid = d.userid GROUP BY c.userid )
FROM `member_company` `c`,`yp_dp` `d`,`yp_relation` `r`
WHERE c.userid = d.userid = r.userid
ORDER BY avgsort1 desc"这个是错误的,求救!
FROM `member_company` `c`,`yp_dp` `d`,`yp_relation` `r`
WHERE c.userid = d.userid = r.userid
GROUP BY c.userid ORDER BY avgprice desc"上面是需要修改的语句,我想把 GROUP BY c.userid移到 from 之前计算,例如下:
sql="SELECT DISTINCT c.*, avgsort1 (select round(AVG(d.sort1)) from `member_company` `c`,`yp_dp` `d` where c.userid = d.userid GROUP BY c.userid )
FROM `member_company` `c`,`yp_dp` `d`,`yp_relation` `r`
WHERE c.userid = d.userid = r.userid
ORDER BY avgsort1 desc"这个是错误的,求救!
参考一下这个贴子的提问方式http://topic.csdn.net/u/20091130/20/8343ee6a-417c-4c2d-9415-fa46604a00cf.html
1. 你的 create table xxx .. 语句
2. 你的 insert into xxx ... 语句
3. 结果是什么样,(并给以简单的算法描述)
4. 你用的数据库名称和版本(经常有人在MS SQL server版问 MySQL)
这样想帮你的人可以直接搭建和你相同的环境,并在给出方案前进行测试,避免文字描述理解上的误差。
(select round(avg(sort1)) from yp_dp where userid=c.userid) avgsort1,
(select round(avg(avgprice)) from yp_dp where userid=c.userid) avgprice
from member_company c
order by avgprice desc