如何计算日期维度的 iso_week_start_date 和 iso_week_end_date?

How to calculate iso_week_start_date and iso_week_end_date for date dimension?

作为日历维度的一部分,我需要填充 iso_week_start_date、iso_week_end_date 和 iso_week_number。除了这些字段,我已经能够构建日历维度。谢谢。

Snowflake 提供 DATE_TRUNC(WEEK, ..) 让您获得 ISO 周的第一天。然后加上 6 天就是最后一天。还有 DATE_EXTRACT(WEEK, ..)(或简称 WEEK(..)

例如:

select extract(week, '2017-10-10'::date), date_trunc(week, '2017-10-10'::date), dateadd(day, 6, date_trunc(week, '2017-10-10'::date));
-----------------------------------+--------------------------------------+-------------------------------------------------------+
 EXTRACT(WEEK, '2017-10-10'::DATE) | DATE_TRUNC(WEEK, '2017-10-10'::DATE) | DATEADD(DAY, 6, DATE_TRUNC(WEEK, '2017-10-10'::DATE)) |
-----------------------------------+--------------------------------------+-------------------------------------------------------+
 41                                | 2017-10-09                           | 2017-10-15                                            |
-----------------------------------+--------------------------------------+-------------------------------------------------------+

请记住,ISO 周有一些奇怪的语义,请参阅文档了解更多详细信息。