Question

我试图选择不同的，我的表评论中的列'内容'，

当我这样做时它会起作用：

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;
        }

但我也需要列

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

当我尝试添加它们时，页面上有很多相同的内容，有没有办法我可以选择表格中的所有字段，但只选择不同的内容列？

感谢

Answer 1

我认为这就是你在寻找伴侣：

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

mysql：在表中选择distinct列？

1 个答案: