上个月每周的数据

简·亚努谢克

我想按上个月的几周对数据进行排序，并且寻找无需手动编写日期即可自动使用的代码。

代替这个：

SELECT
wadat_ist AS 'frame'
,CASE
WHEN wadat_ist BETWEEN '2019-09-01' AND '2019-09-01' THEN 'MA1'
WHEN wadat_ist BETWEEN '2019-09-02' AND '2019-09-08' THEN 'MA2'
WHEN wadat_ist BETWEEN '2019-09-09' AND '2019-09-15' THEN 'MA3'
WHEN wadat_ist BETWEEN '2019-09-16' AND '2019-09-22' THEN 'MA4'
WHEN wadat_ist BETWEEN '2019-09-23' AND '2019-09-30' THEN 'MA5'
END AS 'Activity'

我尝试了这个：

SELECT
wadat_ist AS 'frame'
,CASE
WHEN wadat_ist BETWEEN (SELECT (Convert (DATETIME, (SELECT DATEADD(DAY,1,EOMONTH(GETDATE(),-2)))))) AND  (SELECT DateAdd (wk, 0, (select DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, +0.99999)))) THEN 'MA1'
WHEN wadat_ist BETWEEN (SELECT DateAdd (wk, -4, (SELECT DATEADD(day,-1,DATEadd(MONTH,datediff(month,0,GETDATE()),0))))) AND (SELECT DateAdd (wk, 1, (select DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0)))) THEN 'MA2'
WHEN wadat_ist BETWEEN (SELECT DateAdd (wk, -3, (SELECT DATEADD(day,-1,DATEadd(MONTH,datediff(month,0,GETDATE()),0))))) AND (SELECT DateAdd (wk, 2, (select DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0)))) THEN 'MA3'
WHEN wadat_ist BETWEEN (SELECT DateAdd (wk, -2, (SELECT DATEADD(day,-1,DATEadd(MONTH,datediff(month,0,GETDATE()),0))))) AND (SELECT DateAdd (wk, 3, (select DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0)))) THEN 'MA4'
WHEN wadat_ist BETWEEN (SELECT DateAdd (wk, -1, (SELECT DATEADD(day,-1,DATEadd(MONTH,datediff(month,0,GETDATE()),0))))) AND (SELECT DateAdd (wk, 4, (select DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0)))) THEN 'MA5'
END AS 'Activity'

但是结果却大不相同。第一个星期的值在第二周，第二个星期的值在第三周，依此类推.....所有星期都以某种方式发生了变化...另外，第一个星期（MA1）被标记为NULL，但他的值应该到上个星期（MA5）。

另外，我发现了这个，但它要花上几周的时间，但随着时间的推移，它与装备周数匹配，所以也许在11月1日就可以了，但是我宁愿需要一个可以在一个月的任何时间显示数据的东西。

WHEN wadat_ist BETWEEN (select DATEADD(MONTH, DATEDIFF(MONTH, 0, GETDATE())-1, 0)) AND (select dateadd(wk, datediff(wk, 5, getdate()) - 5, 6)) THEN 'MA1'
WHEN wadat_ist BETWEEN (select dateadd(wk, datediff(wk, 4, getdate()) - 4, 0)) AND (select dateadd(wk, datediff(wk, 4, getdate()) - 4, 6)) THEN 'MA2'
WHEN wadat_ist BETWEEN (select dateadd(wk, datediff(wk, 3, getdate()) - 3, 0)) AND (select dateadd(wk, datediff(wk, 3, getdate()) - 3, 6)) THEN 'MA3'
WHEN wadat_ist BETWEEN (select dateadd(wk, datediff(wk, 2, getdate()) - 2, 0)) AND (select dateadd(wk, datediff(wk, 2, getdate()) - 2, 6)) THEN 'MA4'
WHEN wadat_ist BETWEEN (select dateadd(wk, datediff(wk, 1, getdate()) - 1, 0)) AND (SELECT EOMONTH(getdate(),-1)) THEN 'MA5'

使用T-SQL

米恰尔·图尔钦（MichałTurczyn）

试试下面的（部分）查询，注释是内联的：

-- set monday as first day of week
set datefirst 1;

-- after checking, that 1 of september is 35th week of year, you can do the following:
select case when datepart(week, wadat_ist) = 35 then 'MA1'
            when datepart(week, wadat_ist) = 36 then 'MA2'
            when datepart(week, wadat_ist) = 37 then 'MA3'
            when datepart(week, wadat_ist) = 38 then 'MA4'
            when datepart(week, wadat_ist) = 39 then 'MA5'
       end as 'Activity'

或更短

select case datepart(week, wadat_ist) 
            when 35 then 'MA1'
            when 36 then 'MA2'
            when 37 then 'MA3'
            when 38 then 'MA4'
            when 39 then 'MA5'
       end as 'Activity'

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。