Question

我在redshift中有一个表（pkg_date）。我想获取过去3个月中每个日期的一些数据。

这是我的查询

select * from pkg_data where scan_date < current_date;

如何在查询本身中使用current_date作为变量，并在4月1日之后的每个日期运行此查询。

我设置了一个cron作业，它将每小时运行一次。每小时应以不同的current_date运行

Answer 1

使用dateadd()获取3月初的日期，使用GETDATE()获取当前日期。

ie代码看起来像。

select * from pkg_data where scan_date < dateadd(month,-3,GETDATE());

有关cron的信息，请参见How to execute scheduled SQL script on Amazon Redshift?

Answer 2

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请注意-Redshift在UTC上有效，因此 CURRENT_DATE 可能会受到时区的影响，有时可能会+/-您所期望的。

SELECT *
FROM pkg_data
WHERE scan_date > CURRENT_DATE - INTERVAL '3 months'

返回：

SELECT
  CURRENT_DATE,
  (CURRENT_DATE - INTERVAL '3 months')::date

还要小心几个月的时间！

2018-06-21  2018-03-21

返回：

SELECT DATE '2018-05-31' - INTERVAL '3 months'

请注意，它给出了该月的最后一天（31日对28日）。

顺便说一句，您可以使用2018-02-28 00:00:00或DATE '2018-05-31'，也可以使用'2018-05-31'::DATE或INTERVAL '3 months'来转换类型。

如何对最近3个月的每个日期运行查询

2 个答案: