SQL setting start date to Friday, and read Data between 2 dates - sql

Question

I'm trying to set the start date to friday on a sql query. Which I have done as you can see below. What I need to do now is show all the GameID's between Friday and Saturday, and it refreshes every week (so that every week it shows other games that have been played in that week).
I'm a complete beginner at SQL so any help is greatly appreciated!
I have tried the sql query below.
DECLARE #StartFriday datetime
DECLARE #EndSaturday datetime
SET DATEFIRST 6 -- Set the start of the week to Friday
SELECT *
FROM
(
SELECT GameDate,
DATEADD(w, 0, DATEADD(w, DATEDIFF(w, 0,GETDATE()), -5)) AS 'StartFriday',
DATEADD(w, 0, DATEADD(w, DATEDIFF(w, 0,GETDATE()), 1)) AS 'EndSaturday'
FROM VW_Resultaat_Score
WHERE GameDate BETWEEN 'StartFriday' AND 'EndSaturday' --Show all GameDates between #StartFriday and #EndSaturday
)
I would love any help I can get!
Cheers

Answer 1

Perhaps this will work better:
DECLARE #StartFriday datetime
DECLARE #EndSaturday datetime
SET DATEFIRST 6
Set #StartFriday = DATEADD(w, 0, DATEADD(w, DATEDIFF(w, 0,GETDATE()), -5))
Set #EndSaturday = DATEADD(w, 0, DATEADD(w, DATEDIFF(w, 0,GETDATE()), 1))
SELECT *
FROM
(
SELECT GameDate
FROM VW_Resultaat_Score
WHERE GameDate BETWEEN #StartFriday AND #EndSaturday
)

Answer 2

If you will only ever need the weekend previous, this code will work:
SELECT *
FROM VW_Resultaat_Score
WHERE GameDate BETWEEN
(SELECT DATEADD(d, 1 - datepart(weekday, dateadd(d, 2, getdate())), getdate()))
AND
(SELECT DATEADD(d, 1 - datepart(weekday, dateadd(d, 1, getdate())), getdate()))
Code looks a little crazy, but it works. If you may need to query other specific weekends, this may be an option:
DECLARE #getdate date
SET #getdate='2017-05-16'
SELECT *
FROM VW_Resultaat_Score
WHERE GameDate BETWEEN
(SELECT DATEADD(d, 1 - datepart(weekday, dateadd(d, 2, #getdate)), #getdate))
AND
(SELECT DATEADD(d, 1 - datepart(weekday, dateadd(d, 1, #getdate)), #getdate))
Taking it a step further, you may need to report on each of these weekends. The following code gives you all the Friday Saturdays of each week for 2017.
WITH Fri as
(SELECT DATEPART(YEAR,DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), n.num)) yyyy, DATEPART(wk,DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), n.num)) weeknumber, Fridays = CAST(DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), n.num) as Date)
FROM (SELECT TOP 366 num = ROW_NUMBER() OVER(ORDER BY a.NAME)-1 FROM dbo.syscolumns a, dbo.syscolumns b) n
WHERE DATENAME(weekday, DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), n.num)) = 'Friday')
,
Sat as
(SELECT weeknumber=DATEPART(wk,DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), n.num)), Saturdays = CAST(DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), n.num) as Date)
FROM (SELECT TOP 366 num = ROW_NUMBER() OVER(ORDER BY a.NAME)-1 FROM dbo.syscolumns a, dbo.syscolumns b) n
WHERE DATENAME(weekday, DATEADD(yy, DATEDIFF(yy, 0, GETDATE()), n.num)) = 'Saturday')
Select Fri.weeknumber, fri.yyyy, Fridays, Saturdays
FROM Fri
JOIN Sat on Fri.weeknumber=Sat.weeknumber