内连接功能复制内容

Question

我的查询重复了我得到的条目。我用两个内连接。奇怪的事实是，我在6个月前制作了这段代码，据我记忆，它有效。现在，我回到我的项目，它不再起作用了（它重复）......

查询：

$sql_principale_news = "SELECT sys_pre_values.LKey,bx_blogs_posts.PostUri,bx_blogs_posts.PostCaption,bx_blogs_posts.PostText,bx_blogs_posts.PostText,bx_blogs_posts.Categories,
      bx_blogs_posts.PostDate,bx_blogs_posts.Views,bx_blogs_posts.CommentsCount,bx_blogs_posts.allowView,Profiles.Avatar,Profiles.ID,Profiles.FirstName,Profiles.LastName,Profiles.ProfileType
      FROM bx_blogs_posts
      INNER JOIN Profiles ON bx_blogs_posts.OwnerID=Profiles.ID AND Profiles.Status='Active'
      INNER JOIN sys_pre_values ON bx_blogs_posts.NewsType=sys_pre_values.Value AND sys_pre_values.Value!=sys_pre_values.LKey
      WHERE bx_blogs_posts.OpenNews=1 
        AND bx_blogs_posts.PostStatus='approval'
        AND bx_blogs_posts.Categories IN ('".$innov24_config."')
        AND (bx_blogs_posts.allowView=3 
          OR bx_blogs_posts.allowView=4 
          OR (bx_blogs_posts.allowView=5 AND bx_blogs_posts.OwnerID IN ('".$bigfriendlist."')) 
          OR bx_blogs_posts.allowView IN ('".$privacy_OthersToMe."') 
          OR bx_blogs_posts.allowView IN ('".$privacy_MeToOthers."'))
      ORDER BY bx_blogs_posts.PostDate DESC LIMIT ".$_GET['debut'].",".$nb_affichage_par_page."";

结果：

它会复制每个条目3次。

问题

如果删除第二个内部联接，则不会再有重复。

$sql_principale_news = "SELECT sys_pre_values.LKey,bx_blogs_posts.PostUri,bx_blogs_posts.PostCaption,bx_blogs_posts.PostText,bx_blogs_posts.PostText,bx_blogs_posts.Categories,
      bx_blogs_posts.PostDate,bx_blogs_posts.Views,bx_blogs_posts.CommentsCount,bx_blogs_posts.allowView,Profiles.Avatar,Profiles.ID,Profiles.FirstName,Profiles.LastName,Profiles.ProfileType
      FROM bx_blogs_posts
      INNER JOIN Profiles ON bx_blogs_posts.OwnerID=Profiles.ID AND Profiles.Status='Active'
      // DELETED CODE // INNER JOIN sys_pre_values ON bx_blogs_posts.NewsType=sys_pre_values.Value AND sys_pre_values.Value!=sys_pre_values.LKey// END DELETED CODE //
      WHERE bx_blogs_posts.OpenNews=1 
        AND bx_blogs_posts.PostStatus='approval'
        AND bx_blogs_posts.Categories IN ('".$innov24_config."')
        AND (bx_blogs_posts.allowView=3 
          OR bx_blogs_posts.allowView=4 
          OR (bx_blogs_posts.allowView=5 AND bx_blogs_posts.OwnerID IN ('".$bigfriendlist."')) 
          OR bx_blogs_posts.allowView IN ('".$privacy_OthersToMe."') 
          OR bx_blogs_posts.allowView IN ('".$privacy_MeToOthers."'))
      ORDER BY bx_blogs_posts.PostDate DESC LIMIT ".$_GET['debut'].",".$nb_affichage_par_page."";

有人能说出原因吗？

[编辑]以下是表格结构

Answer 1

您可以使用GROUP BY

试试这个

   $sql_principale_news = "SELECT sys_pre_values.LKey,bx_blogs_posts.PostUri,bx_blogs_posts.PostCaption,bx_blogs_posts.PostText,bx_blogs_posts.PostText,bx_blogs_posts.Categories,
  bx_blogs_posts.PostDate,bx_blogs_posts.Views,bx_blogs_posts.CommentsCount,bx_blogs_posts.allowView,Profiles.Avatar,Profiles.ID,Profiles.FirstName,Profiles.LastName,Profiles.ProfileType
  FROM bx_blogs_posts
  INNER JOIN Profiles ON bx_blogs_posts.OwnerID=Profiles.ID AND Profiles.Status='Active'
   INNER JOIN sys_pre_values ON bx_blogs_posts.NewsType=sys_pre_values.Value AND sys_pre_values.Value!=sys_pre_values.LKey// END DELETED CODE //
  WHERE bx_blogs_posts.OpenNews=1 
    AND bx_blogs_posts.PostStatus='approval'
    AND bx_blogs_posts.Categories IN ('".$innov24_config."')
    AND (bx_blogs_posts.allowView=3 
      OR bx_blogs_posts.allowView=4 
      OR (bx_blogs_posts.allowView=5 AND bx_blogs_posts.OwnerID IN ('".$bigfriendlist."')) 
      OR bx_blogs_posts.allowView IN ('".$privacy_OthersToMe."') 
      OR bx_blogs_posts.allowView IN ('".$privacy_MeToOthers."'))
 GROUP BY sys_pre_values.LKey
  ORDER BY bx_blogs_posts.PostDate DESC LIMIT ".$_GET['debut'].",".$nb_affichage_par_page."";