-- sql server 获取上周几和本周几
-- @@DATEFIRST 每周以周几开始，周一是 1 ，周日是 7 ，有些机器默认是7，有些机器默认是1
SELECT @@DATEFIRST
-- 修改 @@DATEFIRST 的值
SET DATEFIRST 7
-- 查询当前每周是以周几开始，今天是一周的第几天
SELECT @@DATEFIRST as 'startday', DATEPART(dw,GETDATE()) as 'weekday'
-- 通过 WEEKDAY 和 @@DATEFIRST 联合计算，抹平 @@DATEFIRST 设置的差异
-- 上周
SELECT
CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) - 6, GETDATE()) ) as '上周一'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) - 5, GETDATE()) ) as '上周二'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) - 4, GETDATE()) ) as '上周三'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) - 3, GETDATE()) ) as '上周四'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) - 2, GETDATE()) ) as '上周五'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) - 1, GETDATE()) ) as '上周六'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) - 0, GETDATE()) ) as '上周日'
-- 本周
SELECT
CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) + 1, GETDATE()) ) as '本周一'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) + 2, GETDATE()) ) as '本周二'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) + 3, GETDATE()) ) as '本周三'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) + 4, GETDATE()) ) as '本周四'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) + 5, GETDATE()) ) as '本周五'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) + 6, GETDATE()) ) as '本周六'
,CONVERT(DATE, DATEADD(dd, -DATEPART (WEEKDAY ,GETDATE() + @@DATEFIRST - 1) + 7, GETDATE()) ) as '本周日'
