如何将复杂的mysql查询更改为mysql视图

我是一个mysql查询的新手，我想问一下，是否有人能帮我解决我的问题。我有一个（对我来说）复杂的sql。我想把它变成一个视图

SELECT 
    username, 
    user_id,
    sum(result_points) AS count_points, 
    count(result_points) AS activity_done, 
    (
        (
            SELECT count(*) FROM `activity` WHERE periode_id = ''
        ) + 
        (
            SELECT
                IFNULL(sum(acs.result_points), 0) 
            FROM 
                user_activity ua 
            WHERE 
                periode_id = '' 
            AND ua.user_id = user_activity.user_id
            AND ua.result_points IS NOT NULL
        )
    ) AS total
    FROM 
        user_activity 
        LEFT JOIN users ON users.id = user_activity.user_id 
    WHERE 
        periode_id = '' 
    and user_id > 0 
    GROUP BY user_id 
    ORDER BY total DESC

---

有没有办法去掉“where”语句，这样我仍然可以将其更改为view？

如果查询正确，请创建类似view的视图

Create View data as
SELECT 
    username, 
    user_id,
    sum(result_points) AS count_points, 
    count(result_points) AS activity_done, 
    (
        (
            SELECT count(*) FROM `activity` WHERE periode_id = ''
        ) + 
        (
            SELECT
                IFNULL(sum(acs.result_points), 0) 
            FROM 
                user_activity ua 
            WHERE 
                periode_id = '' 
            AND ua.user_id = user_activity.user_id
            AND ua.result_points IS NOT NULL
        )
    ) AS total
    FROM 
        user_activity 
        LEFT JOIN users ON users.id = user_activity.user_id 
    WHERE 
        periode_id = '' 
    and user_id > 0 
    GROUP BY user_id 
    ORDER BY total DESC

从视图中删除where子句并在视图中添加where子句，如

select * from data where user_id > 0 

---

使用此查询定义视图时，您是否遇到任何错误？谢谢您的回答，很抱歉，我发布了一个不明确的sql。因为问题是，我还希望periode_id也在where子句中。不仅是用户id。是否可能？将周期id添加为列，并在视图中作为用户id进行筛选