MySQL合並來自多個表的查詢結果

Question

假設我有兩個表：shares和follow。 當前，我有一個查詢，該查詢返回按日期排序的最新股票，限於25個結果。 我想做的是從關注和共享中查詢，返回最新的25個結果。 但是，我不確定如何執行此操作。

我對股票的查詢是這樣的：

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

我對追隨者的查詢是這樣的：

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

如何合並這些內容，以便如果它從關注者表中進行選擇，則僅接受關注者，關注者和類型，如果它從共享表中進行選擇，則僅獲取ID，名稱等？ 這有可能嗎？

Answer 1

我認為您正在尋找工會...

    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;

您可能需要根據需要調整別名。