How can I know recurrence value in sqlserv

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SQL-Server-2012

I have to insert value 1 or 0 to a column it is based on the recurrence value between 2 dates

I have 2 dates start date and end date and I provide recurrence value(if it is 1 it should consider everyday, if it is 2 it should consider alternate dates like wise). how can I know is today is the date to consider

let me tell clearly that my start date is 20-06-2018 and end date is on some july.
today will I get 1 or 0, if I give recurrence interval 3

What I have tried:

I have tried below

select PARSENAME((DATEDIFF(ww, '2018-06-25',CONVERT(DATE,GETDATE()))/3),1)

select PARSENAME((DATEDIFF(day, '2018-06-20',CONVERT(DATE,GETDATE()))/2),1)

Posted 28-Jun-18 1:30am

CHAITANYA BASAVA KUMAR

Updated 28-Jun-18 6:04am

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Richard Deeming · Accepted Answer · 2018-06-28T06:05:00

If I've understood what you're asking for, something like this should work:

SQL

DECLARE @Today date = GetDate();
DECLARE @StartDate date = '20180620';
DECLARE @EndDate date = '20180701';
DECLARE @RecurEveryDays int = 3;

SELECT CASE
    WHEN @Today < @StartDate THEN CAST(0 As bit)
    WHEN @Today > @EndDate THEN CAST(0 As bit)
    WHEN (DateDiff(day, @StartDate, @Today) % @RecurEveryDays) != 0 THEN CAST(0 As bit)
    ELSE CAST(1 As bit)
END;

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