php – sql帮助从所有粉丝获取数据？ (如果我们关注,请推特)

例如,如果我有

follow table
company one ( cid = 1 ) following two ( cid = 2 )
company one ( cid = 1 ) following three( cid = 3 )

feeds table
company one ( cid = 1 ) type 'product' description 'hello ive updated a product';
company two ( cid = 2 ) type 'product' description 'hello ive updated a product im from company 2';
company three ( cid = 3 ) type 'shoutout' description 'hello ive i got a shoutout im company 3';
company one ( cid = 1 ) type 'product' description 'hello ive updated my second product';

题

如何从我公司的公司获得所有feeds.description(例如这里的cid = 1)？

继承我的简单pdo sql来获得我的.

    $data['feeds']['cid'] = 1;

    return $this->db->fetchAll("SELECT feeds.type, feeds.$type, feeds.cid, feeds.time, companies.name FROM feeds, companies WHERE 
    feeds.cid = :cid AND companies.cid = :cid ORDER BY feeds.fid DESC LIMIT 0, 5", $data['feeds']);

this will display
hello ive updated a product
hello ive updated my second product

也许是这样的？ (失败)

    $data['feeds']['cid'] = 1,2,3;

    return $this->db->fetchAll("SELECT feeds.type, feeds.$type, feeds.cid, feeds.time, companies.name FROM feeds, companies WHERE 
    feeds.cid = :cid AND companies.cid = :cid ORDER BY feeds.fid DESC LIMIT 0, 5", $data['feeds']);

this should be displaying like
hello ive updated a product
hello ive updated a product im from company 2
hello ive i got a shoutout im company 3
hello ive updated my second product

或者更简单的从每个跟随获取feeds.description.following(cid = 1,2,3等)来自我. (cid = 1)
或者如果twitter获得我所有朋友的身份(我关注的朋友)

编辑*

irc mysql的一些好人说要使用连接.但我只是不明白.
我得到的就是这个

fetch all the follow.following from cid = me ( example cid = 1 )

然后

SELECT * FROM feeds WHERE feeds.cid = IN (2,3,cid that im following ( see follow.following )) 

任何人都可以举个例子来加入这个问题吗？

解决方法:

因此,假设问题是“如何从我的公司遵循的公司获得所有feeds.description？”您想使用以下密钥加入：

select 
companies.name, 
feeds.type, 
feeds.description 
from follow 
inner join feeds on (follow.following = feeds.cid or follow.cid = feeds.cid)
inner join companies on (feeds.cid = companies.cid)
where follow.cid = :cid
order by feeds.fid desc 
limit 5;

这应列出您的：cid(1)所遵循的所有公司.

编辑：供稿应该包括我公司正在关注的公司供稿.

标签：php,mysql,sql,pdo,php-5-3
来源： https://codeday.me/bug/20190710/1421823.html