如何使用group更新選擇查詢？

Question

如何更新mobile_users表中的total_talktime行，並使用以下查詢的SUM與正確的user_id？使用組？

這是Select查詢：

SELECT SUM(TIME_TO_SEC(TIMEDIFF(`calls`.`finished_call` , `calls`.`start_call`))) AS `t` , `mobile_users`.`id` 
FROM `mobile_users` 
LEFT JOIN `calls` ON `calls`.`user_id` = `mobile_users`.`id` 
GROUP BY `mobile_users`.`id` 

我怎麼能使其與更新選擇，由含組工作？

Answer 1

嘗試：

UPDATE mobile_users SET total_talktime = (SELECT SUM(TIME_TO_SEC(TIMEDIFF(calls。 finished_call，calls。 start_call）））AS t，mobile_users。 id FROM mobile_users LEFT JOIN calls ON calls。 user_id = musers。 id GROUP BY mobile_users。 id）

Answer 2

我假設你的查詢工作 試試這個

update table 
set total_talktime = (select t from 
(SELECT SUM (TIME_TO_SEC (TIMEDIFF (`calls`.`finished_call` , `calls`.`start_call` ))) AS `t`, `mobile_users`.`id` 
FROM `mobile_users` 
LEFT JOIN `calls` ON `calls`.`user_id` = `musers`.`id` 
GROUP BY `mobile_users`.`id`) as subquery) 

Answer 3

我沒有測試查詢，但希望這有助於：

update table 
set total_talktime = derived.t 
from table, 
(
SELECT SUM(TIME_TO_SEC(TIMEDIFF(`calls`.`finished_call` , `calls`.`start_call`))) AS `t` , `mobile_users`.`id` 
FROM `mobile_users` 
LEFT JOIN `calls` ON `calls`.`user_id` = `mobile_users`.`id` 
GROUP BY `mobile_users`.`id` 
) derived 
where table.userId = derived.id