SQL - 获取当前日期与一周开始和结束之间的所有日期

Question

I am trying to set the start day to Saturday

SET DATEFIRST 6 -- Sets start day to Saturday

And then get all the GameDate between the start of the week and the end of the week. But it needs to be done with the current day. For instance: if the current day is thursday and the end of the week is Friday I don't want to do this:

DECLARE @StartWeek datetime Set @StartWeek = DATEADD(w, 0, DATEADD(w, DATEDIFF(w, 0,GETDATE()), -5))
DECLARE @EndWeek datetime Set @EndWeek = DATEADD(w, 0, DATEADD(w, DATEDIFF(w, 0,GETDATE()), 1))

Because this will make it that the next 5 days will get shown. And If the CurrentDay is on Thursday I don't want the next 5 days to get shown. Just the GameDates from every week.

This is what I got so far:

DECLARE @DateTable Table (DateofWeek Date) -- Creates table
DECLARE @DateToday Date SELECT DAY(GETDATE()) 'Current Day' -- Gets current date

DECLARE @StartWeek datetime Set @StartWeek = DATEADD(w, 0, DATEADD(w, DATEDIFF(w, 0,GETDATE()), -5)) --This is the part thats wrong
DECLARE @EndWeek datetime Set @EndWeek = DATEADD(w, 0, DATEADD(w, DATEDIFF(w, 0,GETDATE()), 1)) --This is the part thats wrong

SET DATEFIRST 6 -- Sets start day to Saturday


SELECT DATEDIFF ( DAY, @DateToday, @EndWeek) AS Diffrence_End
SELECT DATEDIFF ( DAY, @DateToday, @StartWeek) AS Diffrence_Start
    FROM @DateTable

WHILE @DateToday >= @EndWeek AND @DateToday <= @StartWeek -- Shows all gameDates between StartWeek and Endweek
BEGIN   
    SELECT DATEDIFF ( DAY, @DateToday, @EndWeek)
    Insert Into @DateTable



SELECT * 
    FROM @DateTable
END;

Some of the Query is probably wrong, especially the last part.

I hope I made myself clear enough, if there are any questions please don't hesitate to ask me!

Answer 1

Have a look:

 -- Sets start day to Saturday SET DATEFIRST 6 -- Creates table DECLARE @DateTable Table ([DateofWeek] date); -- StartDate = DATEPART(DW, ... ) = 1 DECLARE @StartDate date; SET @StartDate = DATEADD(day, (DATEPART(dw, GETDATE()) - 1) * -1, GETDATE()); -- EndDate = StartDate + 6 days DECLARE @EndDate date; SET @EndDate = DATEADD(day, 6, @StartDate); -- Generates table values DECLARE @CurrentDate date; SET @CurrentDate = @StartDate; WHILE @CurrentDate <= @EndDate BEGIN INSERT INTO @DateTable ([DateofWeek]) VALUES (@CurrentDate); SET @CurrentDate = DATEADD(day, 1, @CurrentDate); END --Check it SELECT *, DATENAME(dw, DateOfWeek) as Name FROM @DateTable;

GO

\nDateofWeek | Name     \n:------------------ |  :-------- \n18/03/2017 00:00:00 |  Saturday \n19/03/2017 00:00:00 |  Sunday   \n20/03/2017 00:00:00 |  Monday   \n21/03/2017 00:00:00 |  Tuesday  \n22/03/2017 00:00:00 |  Wednesday\n23/03/2017 00:00:00 |  Thursday \n24/03/2017 00:00:00 |  Friday   \n

dbfiddle here