Days difference in SQL Server - sql-server

Question

I have a question about SQL Server.
Table: holidaylist
Date | weekendStatus | Holidaystatus
2015-12-01 | 0 | 0
2015-12-02 | 0 | 0
2015-12-03 | 0 | 0
2015-12-04 | 1 | 0
2015-12-05 | 1 | 0
2015-12-06 | 0 | 1
2015-12-07 | 0 | 0
2015-12-08 | 0 | 0
2015-12-09 | 0 | 1
2015-12-10 | 0 | 0
2015-12-11 | 0 | 0
2015-12-12 | 1 | 1
2015-12-13 | 1 | 0
Table: emp
empid | doj | dos
1 | 2015-12-01 | 2015-12-06
2 |2015-12-01 | 2015-12-13
3 |2015-12-03 |2015-12-13
I want get days difference from dos-doj withoutweekenstatusandholidaysstatus
and includeweekendandholidaystatus
I want output like this:
Empid | doj | dos |includeweekendandholidays | witoutincludeweekendandholidayslist
1 | 2015-12-01 |2015-12-06 | 5 | 3
2 | 2015-12-01 |2015-12-13 | 12 | 8
3 | 2015-12-03 |2015-12-13 | 10 | 6
I tried this query:
select
a.empid, a.doj, a.dos,
case
when b.weekendstatus = 1 and c.Holidaystatus = 1
then datediff(day, c.date, b.date)
end as includeweekenandholidays
case
when b.weekendstatus != 1 or c.Holidaystatus = 1
then datediff(day, c.date, b.date)
end as witoutincludeweekendandholidayslist
from
emp a
left join
holidaylist b on a.doj = b.date
left join
holidaylist c on a.dos = c.date
Above query not given expected result please tell me how to write query to achieve this task in SQL Server

Answer 1

Try this :
select a.empid,
a.doj,a.dos,
IncludeRest = (select count(h.date) from holidaylist h where e.doj<=h.date AND e.dos>=h.date),
ExcludeRest = (select count(h.date) from holidaylist h where e.doj<=h.date AND e.dos>=h.date AND h.weekendstatus = 0 AND h.holdaystatus = 0)
from emp e

Answer 2

you can use a CASE in your COUNT to determine whether or not to count that day..
SELECT
e.empid,
e.doj,
e.dos,
COUNT(*) includeweekendandholidays,
COUNT(CASE WHEN Holidaystatus = 0
AND [weekendStatus] = 0 THEN 1
END) withoutincludeweekendandholidayslist
FROM
emp e
JOIN holidaylist hl ON hl.Date >= e.doj
AND hl.Date < e.dos
GROUP BY
e.empid,
e.doj,
e.dos
This might perform better since it only joins to holidaylist table on records you need..
SELECT
e.empid,
e.doj,
e.dos,
DATEDIFF(DAY, e.doj, e.dos) includeweekendandholidays,
COUNT(*) withoutincludeweekendandholidayslist
FROM
emp e
JOIN holidaylist hl ON hl.Date BETWEEN e.doj AND e.dos
WHERE
weekendStatus = 0
AND Holidaystatus = 0
GROUP BY
e.empid,
e.doj,
e.dos,
DATEDIFF(DAY, e.doj, e.dos)
I don't get your output though since it only appears that you're excluding weekends and not holidays..

Answer 3

You can use OUTER APPLY:
SELECT a.empid, a.doj, a.dos,
DATEDIFF(d, a.doj, a.dos) + 1 AS include,
DATEDIFF(d, a.doj, a.dos) + 1 - b.wd - b.hd + b.common AS without
FROM emp AS a
OUTER APPLY (
SELECT SUM(weekendStatus) AS wd,
SUM(Holidaystatus) AS hd,
COUNT(CASE WHEN weekendStatus = 1 AND Holidaystatus = 1 THEN 1 END) AS common
FROM holidaylist
WHERE [Date] BETWEEN a.doj AND a.dos) AS b
For each row of table emp, OUTER APPLY calculates weekendStatus=1 and Holidaystatus=1 rows that correspond to the interval of this row.
Calculated fields selected:
include is the total number of days of the emp interval including weekend days and holidays.
without is the total number of days of the emp interval minus weekend days and holidays. common field makes sure common weekend days and holidays are not subtracted twice.
Note: The above query includes start and end days of the interval in the calculations, so the interval considered is [doj - dos]. You can change the predicate of the WHERE clause in the OUTER APPLY operation so as to exclude start, end, or both, days of the interval.
Demo here

Answer 4

try another way with cross join
select t.empid,t.doj,t.dos,datediff(day,t.doj,t.dos) includeweekendandholidays,
datediff(day,t.doj,t.dos)-isnull(t1.wes,0) as witoutincludeweekendandholidayslist
from #emp t left join (
select empid, sum(hd.Holidaystatus+hd.weekendStatus) wes from
#emp emp cross join #holidaylist hd where hd.[Date] between doj
and dateadd(day,-1,dos) group by empid) t1 on t.empid=t1.empid
sample data
declare #holidaylist table ([Date] date, weekendStatus int, Holidaystatus int)
insert into #holidaylist([Date], weekendStatus, Holidaystatus) values
('2015-12-01' , 0 , 0),
('2015-12-02' , 0 , 0),
('2015-12-03' , 0 , 0),
('2015-12-04' , 1 , 0),
('2015-12-05' , 1 , 0),
('2015-12-06' , 0 , 1),
('2015-12-07' , 0 , 0),
('2015-12-08' , 0 , 0),
('2015-12-09' , 0 , 1),
('2015-12-10' , 0 , 0),
('2015-12-11' , 0 , 0),
('2015-12-12' , 1 , 1),
('2015-12-13' , 1 , 0)
declare #emp table(empid int, doj date, dos date)
insert into #emp (empid,doj,dos) values
(1 , '2015-12-01' , '2015-12-06'),
(2 ,'2015-12-01' , '2015-12-13'),
(3 ,'2015-12-03' ,'2015-12-13')