Daty weekendowe między dwiema datami w SQL - sql, sql-server-2008, tsql

Muszę znaleźć daty weekendów między dwiema podanymi datami. Czy istnieje sposób, aby znaleźć to samo. pracuję na SQL Server 2008.

Odpowiedzi:

DECLARE @fromD date = "2017-04-01", @toD date = "2017-04-30";

WITH cteDate as
(
SELECT ROW_NUMBER() OVER(ORDER BY NEWID()) as id, @fromD as dt,
DATENAME(dw, @fromD) as dtName

UNION ALL

SELECT id + 1 as id, DATEADD(day, 1, dt), DATENAME(dw, DATEADD(day, 1,
dt)) dtName
FROM cteDate
WHERE dt < @toD
)
select dt, dtName from cteDate
WHERE dtName in( "Saturday", "Sunday")
OPTION(MAXRECURSION 0)

zwraca

dt          dtName
-------------------
2017-04-01  Saturday
2017-04-02  Sunday
2017-04-08  Saturday
2017-04-09  Sunday
2017-04-15  Saturday
2017-04-16  Sunday
2017-04-22  Saturday
2017-04-23  Sunday
2017-04-29  Saturday
2017-04-30  Sunday

Tabela kalendarza / tally również poradziłaby sobie, ale tutaj możemy użyć tabeli ad-hoc.

Declare @Date1 date = "2017-01-01"
Declare @Date2 date = "2017-03-31"

Select *
From  (
Select Top (DateDiff(day,@Date1,@Date2)+1) D=DateAdd(day,-1+Row_Number() Over (Order By (select null)),@Date1)
From  master..spt_values n1,master..spt_values n2
) A
Where DateName(WEEKDAY,D) in ("Saturday","Sunday")

Zwroty

D
2017-01-01
2017-01-07
2017-01-08
2017-01-14
2017-01-15
2017-01-21
2017-01-22
2017-01-28
2017-01-29
2017-02-04
2017-02-05
2017-02-11
2017-02-12
2017-02-18
2017-02-19
2017-02-25
2017-02-26
2017-03-04
2017-03-05
2017-03-11
2017-03-12
2017-03-18
2017-03-19
2017-03-25
2017-03-26

Myślę, że ten skrypt odpowie na twoje pytanie:

Declare @fromD datetime = "2014-09-01"
Declare @toD datetime = "2014-09-30"
Declare @cnt int = 0
DECLARE @table table (id int identity (1, 1), dt date, dtname varchar (100))

while @fromD < = @toD
Begin
if datename (weekday, @fromD) in ("Saturday", "Sunday")
INSERT INTO @table
VALUES (@fromD, DATENAME(weekday, @fromD))

SET @fromD = DATEADD(D, 1, @fromD)
END
SELECT
dt,
dtname
FROM @table