假设星期日是 SQL 中一周的第一个日期，获取开始日期和结束日期

Question

我必须创建 2 列：

startdate

和

enddate

，周日作为一周的第一个日期。

这是脚本

SELECT 
    MyDate,
    DATEPART(WEEKDAY, CAST([MyDate] AS date)) AS WEEDAY,
    DATEADD(D, -(DATEPART(WEEKDAY, CAST([MyDate] AS date))), CAST([MyDate] AS date)) StartDate,
    DATEADD(D, (6 - DATEPART(WEEKDAY, CAST([MyDate] AS date))), CAST([MyDate] AS date)) EndDate
FROM 
    MyTable
WHERE 
    MyDate  BETWEEN '2024-02-04' AND '2024-02-10'
ORDER BY 
    MyDate

但是我没有得到想要的结果。

周日 4 应该属于第 4-10 周。

我尝试更改

@@datefirst

，但得到了相同的结果。

你能帮忙吗？

谢谢你

Answer 1

对于

StartDate

，使用工作日的模 7 更简单，对于

EndDate

，只需在

StartDate

上添加六天即可：

SELECT
MyDate,
DATEPART(WEEKDAY, cast([MyDate] as date)) AS WEEDAY,
DATEADD(D, -(DATEPART(WEEKDAY, cast([MyDate] as date)) % 7), cast([MyDate] as date)) StartDate,
DATEADD(D, 6, DATEADD(D, -(DATEPART(WEEKDAY, cast([MyDate] as date)) % 7), cast([MyDate] as date))) EndDate
FROM MyTable
WHERE MyDate  BETWEEN '2024-02-04' AND '2024-02-10'
ORDER BY MyDate