SQL Query for getting nth Weekday date between two dates - sql

Question

My scenario is as below:
#StartDate = 13th of current month
#EndDate = 12th of next month.
I want to get all the date with the day-name for Mondays, Tuesdays, Wednesdays, Thursdays, Fridays, Saturdays and Sundays lying between the start and end date.

Answer 1

Try this:
declare #startDate datetime = '2016-01-13'
declare #endDate datetime = '2016-02-12'
;with dateRange as
(
select [Date] = dateadd(dd, 1, #startDate)
where dateadd(dd, 1, #startDate) < #endDate
union all
select dateadd(dd, 1, [Date])
from dateRange
where dateadd(dd, 1, [Date]) < #endDate
)
select [Date], datename(dw,[Date])
from dateRange

Answer 2

To count the number of each day as per your comment (this should be part of the question really), change the last part of James' answer to this:
select datename(dw,[Date]) as day_name, count([Date]) as number_days
from dateRange group by datename(dw,[Date]), datepart(DW,[Date])
order by datepart(DW,[Date]);

Answer 3

You can try something like this :
DECLARE #StartDate DATETIME
DECLARE #StartDateFixed DATETIME
DECLARE #EndDate DATETIME
DECLARE #NumberOfDays int
SET #StartDate = '2016/01/01'
SET #EndDate = '2016/01/02'
SET #NumberOfDays = DATEDIFF(DAY,#StartDate,#EndDate) + 1
SET #StartDateFixed = DATEADD(DD,-1,#StartDate)
SELECT WeekDay , COUNT(WeekDay)
FROM (
SELECT TOP (#NumberOfDays) WeekDay = DATENAME(DW , DATEADD(DAY,ROW_NUMBER() OVER(ORDER BY spt.name), #StartDateFixed))
FROM [master].[dbo].[spt_values] spt
) A
GROUP BY WeekDay
The output will be
WeekDay
------------------------------ -----------
Friday 1
Saturday 1
(2 row(s) affected)

Answer 4

In case if you need to get current and next date from date number specified such as 13 and 12
Current Month
DECLARE #cur_mont INT = (SELECT MONTH(GETDATE()))
Current Year
DECLARE #cur_year INT = (SELECT YEAR(GETDATE()))
Next Month
DECLARE #nxt_mont INT = (SELECT MONTH(DATEADD(month, 1, GETDATE())))
Next Month year (In case of December year change)
DECLARE #nxt_year INT = (SELECT YEAR(DATEADD(month, 1, GETDATE())))
Create start date
DECLARE #startDate DATETIME = (SELECT CAST(CAST(#cur_year AS varchar) + '-' + CAST(#cur_mont AS varchar) + '-' + CAST(13 AS varchar) AS DATETIME))
Create end date
DECLARE #endDate DATETIME = (SELECT CAST(CAST(#nxt_year AS varchar) + '-' + CAST(#nxt_mont AS varchar) + '-' + CAST(12 AS varchar) AS DATETIME))
Dates between start and end date
SELECT TOP (DATEDIFF(DAY, #startDate, #endDate) + 1)
DATEADD(DAY, ROW_NUMBER() OVER(ORDER BY a.object_id) - 1, #startDate) AS Date,
DATENAME(DW, DATEADD(DAY, ROW_NUMBER() OVER(ORDER BY a.object_id) - 1, #startDate)) AS Day
FROM sys.all_objects a CROSS JOIN sys.all_objects b;

Answer 5

DECLARE #dayStart int = 13, --The day of current month
#dayEnd int = 12, --The day of another month
#howManyMonth int = 1, --How many month to take
#dateStart date,
#dateEnd date
--Here we determine range of the dates
SELECT #dateStart = CONVERT (date,
CAST(DATEPART(Year,GETDATE()) as nvarchar(5))+ '-' +
CASE WHEN LEN(CAST(DATEPART(Month,GETDATE()) as nvarchar(5))) = 1
THEN '0'+CAST(DATEPART(Month,GETDATE()) as nvarchar(5))
ELSE CAST(DATEPART(Month,GETDATE()) as nvarchar(5)) END + '-' +
CAST (#dayStart as nvarchar(5))),
#dateEnd = CONVERT (date,
CAST(DATEPART(Year,DATEADD(Month,#howManyMonth,GETDATE())) as nvarchar(5))+ '-' +
CASE WHEN LEN(CAST(DATEPART(Month,DATEADD(Month,#howManyMonth,GETDATE())) as nvarchar(5))) = 1
THEN '0'+CAST(DATEPART(Month,DATEADD(Month,#howManyMonth,GETDATE())) as nvarchar(5))
ELSE CAST(DATEPART(Month,DATEADD(Month,#howManyMonth,GETDATE())) as nvarchar(5)) END + '-' +
CAST (#dayEnd as nvarchar(5)))
;WITH cte AS (
SELECT #dateStart as date_
UNION ALL
SELECT DATEADD(day,1,date_)
FROM cte
WHERE DATEADD(day,1,date_) <= #dateEnd
)
--Get results
SELECT DATENAME(WEEKDAY,date_) as [DayOfWeek],
COUNT(*) as [DaysCount]
FROM cte
GROUP BY DATEPART(WEEKDAY,date_),
DATENAME(WEEKDAY,date_)
ORDER BY DATEPART(WEEKDAY,date_)
OPTION (MAXRECURSION 0)
Output:
DayOfWeek DaysCount
----------- -----------
Sunday 4
Monday 4
Tuesday 4
Wednesday 5
Thursday 5
Friday 4
Saturday 4
(7 row(s) affected