mySQL多選：1複雜1簡單

Question

我想把兩個查詢放在一起;一個來自我的posts表格，另一個來自我的store_products表格，並將結果顯示在同一頁面上。

，所以我想利用這個......

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 

，並把它與這樣的事情...

SELECT name, price FROM store_products WHERE uid=2 

我試過多次SELECT陳述，UNION，在那裏我」 d通過使用NULL彌補cols的差異，我試過LEFT,RIGHT和INNER聯接，但所有這些操作都是將產品信息添加到其他郵政行中，而不是創建se爲每個產品分配行。

的結果集，我找的就是類似於這個

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

等等

編輯：回答問題。兩個表之間的唯一關係是用戶標識，否則它們是完全獨立的。我想爲訪問者提供帖子和產品的列表，並且我試圖在一個查詢中執行此操作以節省服務器負載，並且將它們放在同一列表中而不是單獨的列表中。

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 

應用程序代碼可以檢查type列，以確定它是否打印Post或Product，並適當地格式化。