我該如何改變我的複雜的MySQL查詢到MySQL視圖

Question

我在MySQL查詢一個nubie，我想問一下，是否如果有一個人誰可以幫我解決我的問題。我有這個複雜的（對我來說）sql。我想把它變成一個視圖。

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 

是否有辦法取出「where」語句，以便我仍然可以將其更改爲查看？

Answer 1

如果查詢是正確的，就像

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 

刪除創建視圖，其中從視圖條款並添加where子句中來看，像

select * from data where user_id > 0