需要mysql查询才能在帖子表中显示POSTS但Post表ID不应与被查看的表ID相匹配..
希望这会让你感到困惑!
我刚附上一张图片,希望有帮助
我只需要在帖子表格中显示ID为8的帖子,因为号码为111的用户不会查看该帖子。他只查看了一个ID为7的帖子。
我的查询:
SELECT Posts.ID,
Posts.NAME,
Posts.TITLE,
Posts.POST,
Posts.VIEWS
FROM Posts, Viewed
WHERE Posts.NUMBER != '".$number."'
AND Posts.ID != Viewed.POSTID
AND Posts.NUMBER = Viewed.NUMBER
没有结果..
请帮助!
答案 0 :(得分:0)
试试这个:
SELECT Posts.ID, Posts.NAME, Posts.TITLE, Posts.POST, Posts.VIEWS
FROM Posts LEFT JOIN Viewed
ON Posts.ID = Viewed.POSTID AND Posts.NUMBER = Viewed.NUMBER
WHERE Viewed.POSTID IS NULL AND
Posts.NUMBER != '".$number."'
使用左连接并仅选择空的Viewed.POSTID。