TSQL - Count on a date - tsql

Question

is it possible to make a statistic with the queries starting from the data so configured?
Table a: registry
id (key)
name
able b: holidays
id (key)
id_anagrafica (foreign key)
data_start
data_end
Query:
SELECT b.id, a.name, b.start_date, b.end_date
FROM registry to INNER JOIN
      holidays b ON (a.id = b.id_anagrafica)
WHERE b.start_date> = getdate ()
So doing I get:
id, name, start_date, end_date
1, Mario, 01/06/2018, 30/06/2018
2, Marino, 08/06/2018, 25/06/2018
3, Maria, 01/07/2018, 05/07/2018
-
-
-
Having only a start_date and end_date I can not know in a day how many people are on holidays.
What I need is:
data, num_pers_in_ferie
01/06/2018, 1
06/02/2018, 1
03/06/2018, 1
-
-
08/06/2018, 2
Can you help me?
Thanks in advance

Answer 1

Check the approach below
create table #registry (id int, name nvarchar(50))
insert into #registry values
(1, 'Mario'),
(2, 'Marino'),
(3, 'Maria')
create table #holidays (id int,id_anagrafica int,data_start date,data_end date)
insert into #holidays
select id, id, '2018-06-01', '2018-06-30'
from #registry
update #holidays set data_start = dateadd(day, 20, data_start), data_end = dateadd(day, -5, data_end)
where id = 2
update #holidays set data_start = dateadd(day, 14, data_start)--, data_end = dateadd(day, -10, data_end)
where id = 3
SELECT b.id, a.name, b.data_start, b.data_end
FROM #registry a
INNER JOIN
#holidays b ON (a.id = b.id_anagrafica)
WHERE b.data_start > = getdate ()
DECLARE #startDate DATETIME=CAST(MONTH(GETDATE()) AS VARCHAR) + '/' + '01/' + + CAST(YEAR(GETDATE()) AS VARCHAR) -- mm/dd/yyyy
DECLARE #endDate DATETIME= GETDATE() -- mm/dd/yyyy
select [DATA] = convert(date, DATEADD(Day,Number,#startDate)),
--se ti serve in italiano usa la riga sotto
--[DATA] = CONVERT(varchar, DATEADD(Day,Number,#startDate), 103)
SUM(case when DATEADD(Day,Number,#startDate) between data_start and data_end then 1 else 0 end) Pers_in_Ferie
from master..spt_values c,
#registry a
INNER JOIN
#holidays b ON (a.id = b.id_anagrafica)
where c.Type='P' and DATEADD(Day,Number,#startDate) >=data_start and DATEADD(Day,Number,#startDate) <=data_end
group by DATEADD(Day,Number,#startDate)
order by [DATA]
drop table #holidays
drop table #registry
Output:
DATA Pers_in_Ferie
---------- -------------
2018-06-01 1
2018-06-02 1
2018-06-03 1
2018-06-04 1
2018-06-05 1
2018-06-06 1
2018-06-07 1
2018-06-08 1
2018-06-09 1
2018-06-10 1
2018-06-11 1
2018-06-12 1
2018-06-13 1
2018-06-14 1
2018-06-15 2
2018-06-16 2
2018-06-17 2
2018-06-18 2
2018-06-19 2
2018-06-20 2
2018-06-21 3
2018-06-22 3
2018-06-23 3
2018-06-24 3
2018-06-25 3
2018-06-26 2
2018-06-27 2
2018-06-28 2
2018-06-29 2
2018-06-30 2
(30 rows affected)