Conditional Count On Row_Number - sql

Question

I have a query that calculates the number working days within a month based on a table which stores all our public holidays.
The current output would show all working days, excluding public holidays and Saturday and Sunday, I would like to show each day of the month, but don't increment on a public holiday or Saturday or Sunday.
Is there a way to conditionally increment the row number?
Query is below:
DECLARE #startnum INT=0
DECLARE #endnum INT=365;
WITH gen AS
(
SELECT #startnum AS num
UNION ALL
SELECT num + 1
FROM gen
WHERE num + 1 <= #endnum
)
, holidays AS
(
SELECT CONVERT(DATE, transdate) AS HolidayDate
FROM WORKCALENDER w
WHERE w.CALENDARID = 'PubHoliday'
)
, allDays AS
(
SELECT DATEADD( d, num, CONVERT( DATE, '1 Jan 2016' ) ) AS DateOfYear
, DATENAME( dw, DATEADD( d, num, CONVERT( DATE, '1 Jan 2016' ))) AS [dayOfWeek]
FROM gen
)
select number = ROW_NUMBER() OVER ( ORDER BY DateOfYear )
, *
from allDays
LEFT OUTER JOIN holidays
ON allDays.DateOfYear = holidays.HolidayDate
WHERE holidays.HolidayDate IS NULL
AND allDays.dayOfWeek NOT IN ( 'Saturday', 'Sunday')
AND DateOfYear >= CONVERT( DATE, '1 ' + DATENAME( MONTH, GETDATE() ) + ' 2016' )
AND DateOfYear < CONVERT( DATE, '1 ' + DATENAME( MONTH, DATEADD( month, 1, GETDATE()) ) + ' 2016' )
option (maxrecursion 10000)

Answer 1

kind of pseudo code
select date, row_number() over (order by date) as num
from ( select date
from allDates
where month = x and weekday
exept
select date
from holidays
where month is x
) as t
union all
select date, null
from holidays
where month is x
order by date

Answer 2

You could use a windowed sum, see how the output of WorkdaySequenceInMonth is composed.
DECLARE #startDate DATE = '20160101'
, #numDays INT = 365
, #num INT = 0;
DECLARE #Holidays TABLE (Holiday DATE);
INSERT INTO #Holidays(Holiday)
VALUES ('20160101')
, ('20160115')
, ('20160714');
WITH nums AS
(
SELECT row_number() OVER (ORDER BY object_id) - 1 as num
FROM sys.columns
),
dateRange as
(
SELECT
DATEADD(DAY, num, #startDate) AS Dt
, num
FROM nums
WHERE num < #numDays
),
Parts AS
(
SELECT
R.Dt as [Date]
, Year(R.Dt) as [Year]
, Month(R.Dt) as [Month]
, Day(R.Dt) as [Day]
, Datename(weekday, R.Dt) as [Weekday]
, CASE WHEN H.Holiday IS NOT NULL
OR Datename(weekday, R.Dt) IN ('Saturday', 'Sunday')
THEN 0
ELSE 1
END AS IsWorkday
FROM dateRange R
LEFT JOIN #Holidays H ON R.Dt = H.Holiday
)
--
select
*
, sum(IsWorkday) over (PARTITION BY [Year],[month]
ORDER BY [Day]
ROWS UNBOUNDED PRECEDING) as WorkdaySequenceInMonth
from Parts
order by [Year], [Month]

Answer 3

Hi You can try this query, the initial part is the data generation, maybe you won't need it.
Then I generate a temp table with all the dates for the time period set in #StartYear, #EndYear
Then just simple queries to return the data
-- generate holidays table
select holiday
into #tempHolidays
from
(
select '20160101' as holiday
union all
select '20160201' as holiday
union all
select '20160205' as holiday
union all
select '20160301' as holiday
union all
select '20160309' as holiday
union all
select '20160315' as holiday
) as t
create table #tempCalendar (Date_temp date)
select * from
#tempHolidays
declare #startYear int , #endYear int, #i int, #dateStart datetime , #dateEnd datetime, #date datetime, #i = 0
Select #startYear = '2016'
,#endYear = '2016'
,#dateStart = (Select cast( (cast(#startYear as varchar(4)) +'0101') as datetime))
,#dateEnd = (Select cast( (cast(#startYear as varchar(4)) +'1231') as datetime))
,#date = #dateStart
--Insert dates of the period of time
while (#date <> #dateEnd)
begin
insert into #tempCalendar
Select #date
set #date = (select DATEADD(dd,1,#date))
end
-- Retrive Date list
Select Date_temp
from #tempCalendar
where Date_temp not in (Select holiday from #tempHolidays)
and datename(weekday,Date_temp) not in ('Saturday','Sunday')
--REtrieve sum of working days per month
select DATEPART(year,Date_temp) as year
,DATEPART(month,Date_temp) as Month
,Count(*) as CountOfWorkingDays
from #tempCalendar
where Date_temp not in (Select holiday from #tempHolidays)
and datename(weekday,Date_temp) not in ('Saturday','Sunday')
Group by DATEPART(year,Date_temp)
,DATEPART(month,Date_temp)
You should change #tempHolidays for your Holidays table, and use #StarYear and #EndYear as your time period.

Answer 4

Here's a simple demo that shows the use of the partition by clause to keep contiguity in your sequencing for non-holidays
IF OBJECT_ID('tempdb.dbo.#dates') IS NOT null
DROP TABLE #dates;
CREATE TABLE #dates (d DATE);
IF OBJECT_ID('tempdb.dbo.#holidays') IS NOT null
DROP TABLE #holidays;
CREATE TABLE #holidays (d DATE);
INSERT INTO [#holidays]
( [d] )
VALUES
('2016-12-25'),
('2017-12-25'),
('2018-12-25');
INSERT INTO [#dates]
( [d] )
SELECT TOP 1000 DATEADD(DAY, n, '2015-12-31')
FROM [Util].dbo.[Numbers] AS [n];
WITH holidays AS (
SELECT d.*, CASE WHEN h.d IS NULL THEN 0 ELSE 1 END AS [IsHoliday]
FROM [#dates] AS [d]
LEFT JOIN [#holidays] AS [h]
ON [d].[d] = [h].[d]
)
SELECT d, ROW_NUMBER() OVER (PARTITION BY [holidays].[IsHoliday] ORDER BY d)
FROM [holidays]
ORDER BY d;
And please forgive my marking only Christmas as a holiday!