查询左连接where子句错误

Question

抱歉，基本问题:

select `plans`.`name`, `A`.`subscription_id`, `A`.`amount`, 
       `A`.`created_date`, `A`.`end_date`, 
       `A`.`subscription_status`, `users`.`email`, `A`.`plan_id`, 
       `A`.`user_id`, `usage`.`created_at` as `usagedate`,
        COUNT(usage.id) as used_count
from `subscriptions` A
left join `users` on `users`.`id` = `A`.`user_id` 
left join `plans` on `A`.`plan_id` = `plans`.`Id` 
left join `usage` on `A`.`user_id` = `usage`.`user_id` 
where `usage`.`created_at` between A.created_at and A.end_date
group by `A`.`plan_id`

我得到错误

1054 - where子句中未知列A.created_at

Answer 1

我认为应该有A.created_date而不是A.created_at

select `plans`.`name`, `A`.`subscription_id`, `A`.`amount`, 
`A`.`created_date`, `A`.`end_date`, 
`A`.`subscription_status`, `users`.`email`, `A`.`plan_id`, 
`A`.`user_id`, `usage`.`created_at` as `usagedate`, COUNT(usage.id) as 
used_count from `subscriptions`     A
left join `users` on `users`.`id` = `A`.`user_id` 
left join `plans` on `A`.`plan_id` = `plans`.`Id` 
left join `usage` on `A`.`user_id` = `usage`.`user_id` 
where 
`usage`.`created_at` between A.created_date and A.end_date
group by 
`A`.`plan_id`

Answer 2

我想应该是a.created_date

SELECT `p`.`name`, `A`.`subscription_id`, `A`.`amount`, `A`.`created_date`, `A`.`end_date`, `A`.`subscription_status`, `u`.`email`, `A`.`plan_id`, `A`.`user_id`, `us`.`created_at` AS `usagedate`, COUNT(`us`.`id`) AS `used_count` 
FROM `subscriptions` A
LEFT JOIN `users` u on `u`.`id` = `A`.`user_id` 
LEFT JOIN `plans` p on `A`.`plan_id` = `p`.`Id` 
LEFT JOIN `usage` us on `A`.`user_id` = `us`.`user_id` 
WHERE `us`.`created_at` between `A`.`created_date` and `A`.`end_date`
GROUP BY `A`.`plan_id`