postgres sql - generate_series for date - 如何在日期上做一个 WHERE 条件（有时区）

Question

我在下面的 generate_series 个日期上有一个 postgres SQL 查询（带有时区，因为我希望它是特定时区的），我想放置一个 WHERE 条件以根据条件进行过滤在特定日期。我尝试使用以下 WHERE 语句但失败了。

where d::date = "2020-11-21"

您也可以在这里测试我的查询 - https://dbfiddle.uk/?rdbms=postgres_13&fiddle=b62dcd5f867a352645c0b2944a32a010

SELECT 
     d::date  AT TIME ZONE 'Asia/Tokyo' AS created_date,  
     e.id,  
     e.name,
     e.division_id,
     MIN(a.created_at) FILTER (WHERE a.activity_type = 1) as min_time_in,
     MAX(a.created_at) FILTER (WHERE a.activity_type = 2) as max_time_out
FROM    (SELECT MIN(created_at), MAX(created_at) FROM attendance) AS r(startdate,enddate)
  , generate_series(
        startdate::timestamp, 
        enddate::timestamp, 
        interval '1 day') g(d)
    CROSS JOIN  employee e
    LEFT JOIN   attendance a ON a.created_at::date = d::date AND e.id = a.employee_id
    where d::date = "2020-11-21" <--- this is an error, how do I query on a specific date
GROUP BY 
    created_date
  , e.id
  , e.name
  , e.division_id
ORDER BY 
    created_date
  , e.id;

它抱怨：

ERROR:  column "2020-11-21" does not exist
LINE 15:     where d::date = "2020-11-21"

Answer 1

双引号代表标识符，而你想要的是文字日期。您可以使用标准文字日期来表达这一点：

where d::date = date '2020-11-21'

或使用 Postgres 转换：

where d::date = '2020-11-21'::date

如果d没有时间成分，则不需要转换：

where d = date '2020-11-21'

如果发生这种情况，您仍然可以使用半开过滤器避免强制转换：

where d >= date '2020-11-21' and d < date '2020-11-21' + interval '1 day'

postgres sql - generate_series for date - 如何在日期上做一个 WHERE 条件（有时区）

postgres sql - generate_series for date - how to do a WHERE condition on the date (has timezone)

sql

postgresql

datetime

where-clause

generate-series