Question

我正在尝试在我的mysql查询中写一个条件：

    SELECT g.* FROM groups AS g
            JOIN users AS u 
            ON u.user_posts >= g.post_min
            AND u.user_posts <= g.post_max
            AND u.points >= g.point_min
            AND u.points <= g.point_max
            AND u.uid = "'.$uid.'"

当g.post_max或g.point_max等于0时，如何编写条件语句不需要包含最大值

Answer 1

    $sql = 'SELECT g.id,g.point_amount
            FROM groups AS g
            JOIN users AS u 
            ON u.user_posts >= g.post_min
            AND (u.user_posts <= g.post_max OR (g.post_max=0 OR g.point_max=0))
            AND u.points >= g.point_min
            AND (u.points <= g.point_max OR (g.post_max=0 OR g.point_max=0))
            AND u.uid = "'.$uid.'" 
            LIMIT 1';

Answer 2

用OR加入他们;要么跳过条件为真，要么不能跳过术语：

(g.post_max = 0) OR (u.user_posts <= g.post_max)
(g.point_max = 0) OR (u.points <= g.point_max)

编辑：将其插入您的查询：

$sql = 'SELECT g.id,g.point_amount
        FROM groups AS g
        JOIN users AS u 
        ON u.user_posts >= g.post_min
        AND u.points >= g.point_min
        AND ((g.post_max = 0) OR (u.user_posts <= g.post_max))
        AND ((g.point_max = 0) OR (u.points <= g.point_max))
        AND u.uid = "'.$uid.'" 
        LIMIT 1';

再次编辑：我在阅读时失败了;误解了你的问题。这应该是它的样子。

mysql语句中的条件

2 个答案: