Mysql 获取包含WHERE和GROUP BY的最低值的完整行
我想显示一个预览页面,每个图片组有一张图片,位置最低,在线=Y 添加我想在线获取该组的全部图片(如果可能) 我有一个图片库的下表:Mysql 获取包含WHERE和GROUP BY的最低值的完整行,mysql,sql,group-by,min,Mysql,Sql,Group By,Min,我想显示一个预览页面,每个图片组有一张图片,位置最低,在线=Y 添加我想在线获取该组的全部图片(如果可能) 我有一个图片库的下表: PicID(autoinc) | PicGrp(INT) | Online(Y|N) | Pos(0-10,unique within Grp) | ... | Description 1 | 1 | Y | 0 2 | 1 | Y | 1 3 | 2 | N | 1 4 | 2 | N | 3 5 | 2 | Y | 7 6 | 2 | Y | 2 7 | 2
PicID(autoinc) | PicGrp(INT) | Online(Y|N) | Pos(0-10,unique within Grp) | ... | Description
1 | 1 | Y | 0
2 | 1 | Y | 1
3 | 2 | N | 1
4 | 2 | N | 3
5 | 2 | Y | 7
6 | 2 | Y | 2
7 | 2 | Y | 10
因此,我希望:
1 | 1 | Y | 0 | ... | Description | Total(2)
6 | 2 | Y | 2 | ... | Description | Total(3)
一个方向..当然不行:-)
很确定这就是你想要的:
select y.picid, y.picgrp, y.online, y.pos, count(z.picid) as total
from pictures y
join pictures z
on y.picgrp = z.picgrp
and y.online = z.online
where y.pos = (select min(x.pos)
from pictures x
where x.picgrp = y.picgrp
and x.online = 'Y')
and y.online = 'Y'
group by y.picid, y.picgrp, y.online, y.pos
编辑以包括计数。
select y.picid, y.picgrp, y.online, y.pos, count(z.picid) as total
from pictures y
join pictures z
on y.picgrp = z.picgrp
and y.online = z.online
where y.pos = (select min(x.pos)
from pictures x
where x.picgrp = y.picgrp
and x.online = 'Y')
and y.online = 'Y'
group by y.picid, y.picgrp, y.online, y.pos