更改一周的开始日期黑斑羚

Question

我正在尝试更改一周的开始日期，但无法实现 当前是周一至周日，应定为周日至周六 我尝试在以下数据集invoice date和invoice_week上使用此查询

 SELECT invoice_date,
        weekofyear(invoice_date) as invoice_week,
        datesub(invoice_date,1),
        weekofyear(datesub(invoice_date,1)) as invoice_week1 
   from table

Answer 1

我认为不要将日期减1，而应将日期加1：

select 
        invoice_date,
        weekofyear(invoice_date) as invoice_week,
        adddate(invoice_date,1),
        weekofyear(adddate(invoice_date,1)) as invoice_week1 
from(
        select cast('2018-01-07 16:00:00' as timestamp) invoice_date
)stg

Answer 2

找到了可行的解决方案。给定一个日期，如果您要星期天-周六，而不是默认情况下的星期一-周日，则这是一周开始和一周结束的日期。

SET var:date=2019-01-06;
select  to_date(IF( dayofweek(cast('${var:date}' as timestamp)) = 1, cast('${var:date}' as timestamp), trunc(cast('${var:date}' as timestamp), 'd') - interval 1 day)) as startOfWeek, to_date(IF( dayofweek(cast('${var:date}' as timestamp)) = 1, (trunc(cast('${var:date}' as timestamp) + interval 1 day, 'd') + interval 5 day), (trunc(cast('${var:date}' as timestamp), 'd') + interval 5 day) )) as endOfWeek;
+-------------+------------+
| startofweek | endofweek  |
+-------------+------------+
| 2019-01-06  | 2019-01-12 |
+-------------+------------+