来自子查询的mysql多个字段

Question

SELECT 
  (SELECT date FROM forums WHERE topic_id=f.id OR id=f.id ORDER BY id DESC LIMIT 1) as last_reply, 
  f.*, p.id as pid, p.name FROM forums f 
      INNER JOIN players p ON p.id = f.author 
  WHERE f.topic_id=0 ORDER BY f.id DESC

在子查询中，我不仅要返回date 字段，还要返回author 字段。我该怎么做？

看过类似的帖子，但无法将其应用到我的帖子中。

Answer 1

我会这样做:

SELECT 
  (SELECT date FROM forums WHERE topic_id=f.id OR id=f.id ORDER BY id DESC LIMIT 1) as last_reply,
  (SELECT author FROM forums WHERE topic_id=f.id OR id=f.id ORDER BY id DESC LIMIT 1) as last_author,
  f.*, p.id as pid, p.name FROM forums f 
      INNER JOIN players p ON p.id = f.author 
  WHERE f.topic_id=0 ORDER BY f.id DESC

我实际上会再次重复子查询