mySQL多选：1复杂1简单

Question

我想把两个查询放在一起;一个来自我的posts表格，另一个来自我的store_products表格，并将结果显示在同一页面上。

，所以我想利用这个......

SELECT 
     p.id AS pid 
    , p.uid 
    , p.title 
    , p.created_at 
    , u.id AS uid 
    , u.username 
    , u.avatar 
    , f.following 
    , l.uid AS liked 
    , u2.username AS source_username 
    , u2.avatar AS source_avatar 
    , u2.created_at AS source_created_at 
FROM posts p 
LEFT JOIN users u ON p.uid=u.id 
LEFT JOIN posts_likes l ON l.pid=p.id 
LEFT JOIN follow f ON u.id = f.following 
LEFT JOIN posts p2 ON p.source_hash = p2.hash 
LEFT JOIN users u2 ON u2.id = p2.uid 
WHERE (f.user=2 OR p.uid=2) 
GROUP BY p.id ORDER BY p.id DESC 

，并把它与这样的事情...

SELECT name, price FROM store_products WHERE uid=2 

我试过多次SELECT陈述，UNION，在那里我” d通过使用NULL弥补cols的差异，我试过LEFT,RIGHT和INNER联接，但所有这些操作都是将产品信息添加到其他邮政行中，而不是创建se为每个产品分配行。

的结果集，我找的就是类似于这个

[0] Post 1 
[1] Post 2 
[2] Product 1 
[3] Post 3 
[4] Product 2 

等等

编辑：回答问题。两个表之间的唯一关系是用户标识，否则它们是完全独立的。我想为访问者提供帖子和产品的列表，并且我试图在一个查询中执行此操作以节省服务器负载，并且将它们放在同一列表中而不是单独的列表中。

Answer 1

使用UNION：

SELECT 
     "Post" AS type, 
    , p.id AS pid 
    , p.uid 
    , p.title 
    , p.created_at 
    , u.id AS uid 
    , u.username 
    , u.avatar 
    , f.following 
    , l.uid AS liked 
    , u2.username AS source_username 
    , u2.avatar AS source_avatar 
    , u2.created_at AS source_created_at 
    , NULL AS product_name 
    , NULL AS price 
FROM posts p 
LEFT JOIN users u ON p.uid=u.id 
LEFT JOIN posts_likes l ON l.pid=p.id 
LEFT JOIN follow f ON u.id = f.following 
LEFT JOIN posts p2 ON p.source_hash = p2.hash 
LEFT JOIN users u2 ON u2.id = p2.uid 
WHERE (f.user=2 OR p.uid=2) 
GROUP BY p.id 
ORDER BY p.id DESC 

UNION 

SELECT 
     "Product" AS type 
    , NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL 
    , name, price 
FROM store_products 
WHERE uid = 2 

应用程序代码可以检查type列，以确定它是否打印Post或Product，并适当地格式化。