如何对最近3个月的每个日期运行查询

时间:2018-06-21 08:01:33

标签: sql amazon-web-services cron amazon-redshift

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

2 个答案:

答案 0 :(得分:0)

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?

答案 1 :(得分:0)

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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 DATE '2018-05-31',也可以使用'2018-05-31'::DATEINTERVAL '3 months'来转换类型。