mysql：在表中選擇不同的列？

Question

我嘗試選擇不同的，列在我的表評論「內容」，

它工作時，我這樣做：

function get_new_reviews() { 
      global $connection; 
      global $_SESSION; 
      $query = "SELECT DISTINCT r.content 
         FROM ptb_reviews r, ptb_profiles p 
         WHERE r.to_user_id =".$_SESSION['user_id']." 
         AND r.deleted = '0' 
         AND r.read_review = '0' 
         AND r.approved = '0' 
         AND r.from_user_id != '0' 
         ORDER BY r.date_added DESC 
         LIMIT 0, 14"; 


         $reviews_set = mysql_query($query, $connection); 
      confirm_query($reviews_set); 
      return $reviews_set; 
     } 

，但我還需要列

r.from_user_id, p.display_name, r.id reviews_id, r.date_added 

當我嘗試並將它們添加到它有很多相同的內容向下頁面，有沒有辦法我可以只選擇我的表中的所有字段，但只有不同的選擇內容列？

感謝

Answer 1

我認爲這是你在找什麼伴侶：

SELECT * 
FROM (
    SELECT r.content, r.from_user_id, p.display_name, r.id reviews_id, r.date_added 
    FROM ptb_reviews r, ptb_profiles p 
    WHERE r.to_user_id =".$_SESSION['user_id']." 
     AND r.deleted = '0' 
     AND r.read_review = '0' 
     AND r.approved = '0' 
     AND r.from_user_id != '0' 
    GROUP BY r.content 
    LIMIT 0, 14 
) t1 
ORDER BY date_added DESC