php - mysql 语句中的条件

Question

我正在尝试在 mysql 查询中写入一个条件:

    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，语句不需要包含最大值，我应该如何编写条件

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';