mysql - SQL INNER JOIN 没有返回我需要的内容

Question

$rs25 = $connector->query("
    SELECT * FROM
    (SELECT content.*,topics.title AS topi2 FROM content 
      INNER JOIN topics 
      ON topics.id=content.topic) a
    WHERE a.user='$sf' ORDER BY a.date DESC");

我认为问题出在这个语法上。我想做的是 SELECT topics.title WHERE content.topic=topics.id 并按 content.date (DATETIME) DESC 排序 或者也许我没有使用正确的连接？谢谢。

Answer 1

实际上不需要您问题中的子查询，只需执行以下操作即可:

SELECT content.*,topics.title AS topi2 
FROM content  INNER JOIN topics 
ON topics.id = content.topic
WHERE content.user='$sf' 
ORDER BY content.date DESC