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sql关于相同父ID最多取3记录

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Jun 23, 2016 pm 02:08 PM

表 imginfo
id    fid    miaoshu
1      3     aaaaaaa
2      3     sssssss
3      3     fffff
4      4     uuuuuuuu
5      5     gfgfgfgfgf
6      5     ddfdfdfd
7      9     fdffdfd
8      9     dfdfdfd
9      9     dfdfdf
10     9     popopop
11     3     tgtrtyrtyry
12     5      fdsjfdfdl

SELECT * FROM `imginfo` WHERE fid in(3,5,9) ORDER BY `id` DESC
上面这条语句fid 3,5,9全部内容都获取了。

现在我只想每条相同fid最多获取3条，排序不变，sql语句怎么写？
请大家指教请高人指教。不胜感激！

回复讨论(解决方案)

你SQL取出来在php那端每个值取3个不就结了？

拍完序之后仅获取前三条的话可以用limit0,3;

select a.* from imginfo a where 3 > (select count(*) from imginfo where fid = a.fid and id > a.id and fid in(3,5,9)) and fid in(3,5,9) order by a.fid,a.id

SQL语句如下：
select a.* from imginfo a where 3 > (select count(*) from imginfo where fid = a.fid and id > a.id and fid in(3,5,9)) and fid in(3,5,9) order by a.fid,a.id

如果只是按ID降序，排序改下就好
select a.* from imginfo a where 3 > (select count(*) from imginfo where fid = a.fid and id > a.id and fid in(3,5,9)) and fid in(3,5,9) order by a.id desc

可以这样的哦，学习了。

学习了！谢谢版主。

select a.* from imginfo a where 3 > (select count(*) from imginfo where fid = a.fid and id > a.id and fid in(3,5,9)) and fid in(3,5,9) order by a.fid,a.id

版主想问下我想按照条数的多少来排序该怎么做呢？比如fid 为3的有5条为9的有10条为5的有3条排序就为 9 3 5 请问怎么实现了谢谢了

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