查询今天尚未完成调查的用户并收到错误

如何解决查询今天尚未完成调查的用户并收到错误

我有一个正在使用的功能，我需要我的PostgreSQL数据库来返回今天尚未完成调查的所有用户。

select distinct *
from users 
left join survey_results
on users.user_id = survey_results.user_id
where customer_id = '9000'
and survey_results.created_at < (DATE_PART('year',survey_results.created_at) = (SELECT EXTRACT(YEAR FROM CURRENT_TIMESTAMP))
                                  AND DATE_PART('month',survey_results.created_at) = (SELECT EXTRACT(MONTH FROM CURRENT_TIMESTAMP)) 
                                  AND DATE_PART('day',survey_results.created_at) = (SELECT EXTRACT(DAY FROM CURRENT_TIMESTAMP)))

我正在使用左联接来联接我的调查结果表，并按customer_id进行过滤，并且survey_results.created在

我在运行查询而不是结果时收到此输出。

ERROR:  operator does not exist: timestamp with time zone < boolean
LINE 6: and survey_results.created_at < (DATE_PART('year',survey_re...
                                      ^
HINT:  No operator matches the given name and argument type(s). You might need to add explicit type casts.
SQL state: 42883
Character: 155

解决方法

与其使用datepart，不如将其与current_date进行比较-

select distinct *
from users 
left join survey_results
on users.user_id = survey_results.user_id
where customer_id = '9000'
and survey_results.created_at < CURRENT_DATE

如果您的survey_results.created_at列为时间戳，请使用日期函数将其转换为日期，然后将其与current_date进行比较-

select distinct *
from users 
left join survey_results
on users.user_id = survey_results.user_id
where customer_id = '9000'
and DATE(survey_results.created_at) < CURRENT_DATE

,

使用NOT EXISTS和today()代替CURRENT_TIMESTAMP：

SELECT *
FROM users 
WHERE NOT EXISTS (
  SELECT
  FROM survey_results
  WHERE users.user_id = survey_results.user_id
  AND survey_results.created_at < today()
)
AND customer_id = '9000'

返回所有在今天之前 未完成调查的人。