MySQL將來自多個表的查詢結果結合起來

Question

假設我有兩個表：share和follow。目前，我有一個查詢返回按日期排序的最新股票，限於25個結果。我想要做的是從後續和股票查詢，返回最新的25個結果。但是，我不確定如何做到這一點。

我的股份查詢，像這樣：

select s.id, s.name, s.sharer, s.type from shares s where id = :id order by s.date desc limit 0,25 

我的追隨者查詢，像這樣：

select f.follower, f.following, f.type from followers f where f.following = :id order by f.date desc limit 0,25 

我怎麼能結合這些，這樣，如果從追隨者表中選擇，它只需要追隨者，追隨者和類型，如果它從共享表中選擇，它只需要id，名稱等？這甚至有可能嗎？

Answer 1

我認爲你正在尋找一個工會 ...

select id, name, sharer, type from (  
    (select s.id as id, 
      s.name as name, 
      s.sharer as sharer, 
      s.type as type, 
      s.date as date 
     from shares s 
     where id = :id order by s.date desc) 
     UNION 
    (select f.follower as id, 
      f.following as name, 
      f.following as sharer, 
      f.type as type, 
      f.date as date 
     from followers f 
     where f.following = :id order by f.date desc)) 
     order by date desc limit 0,25; 

您可能需要爲需要調整的別名。