Open Ticket Count Per Day - sql

Question

I have a table that looks like this
id | Submit_Date | Close_Date
------------------------------
1 | 2015-02-01 | 2015-02-05
2 | 2015-02-02 | 2015-02-04
3 | 2015-02-03 | 2015-02-05
4 | 2015-02-04 | 2015-02-06
5 | 2015-02-05 | 2015-02-07
6 | 2015-02-06 | 2015-02-07
7 | 2015-02-07 | 2015-02-08
I can get a count of how many ticket were open on a particular day with this:
Select count(*) from tickets where '2015-02-05' BETWEEN Submit_Date and Close_Date
This gives me 4, but I need this count for each day of a month. I don't want to have to write 30 queries to handle this. Is there a way to capture broken down by multiple days?

Answer 1

I created a solution a way back using a mix of #Heinzi s solution with the trick from Generate a resultset of incrementing dates in TSQL
declare #dt datetime, #dtEnd datetime
set #dt = getdate()
set #dtEnd = dateadd(day, 100, #dt)
SELECT dates.myDate,
(SELECT COUNT(*)
FROM tickets
WHERE myDate BETWEEN Submit_Date and Close_Date
)
FROM
(select Dates_To_Checkselect dateadd(day, number, #dt) mydate
from
(select distinct number from master.dbo.spt_values
where name is null
) n
where dateadd(day, number, #dt) < #dtEnd) dates
Code is combined from memory, I don't have it in front of me so there can be some typo's

Answer 2

First, you'll need a table that contains each date you want to check. You can use a temporary table for that. Let's assume that this table is called Dates_To_Check and has a field myDate:
SELECT myDate,
(SELECT COUNT(*)
FROM tickets
WHERE myDate BETWEEN Submit_Date and Close_Date)
FROM Dates_To_Check
Alternatively, you can create a huge table containing every possible date and use a WHERE clause to restrict the dates to those you are interested in.

Answer 3

If you're in SQL Server 2012 or newer you can do this using window functions with a small trick where you add 1 to the open days -1 to the closing days and then do a running total of this amount:
select distinct date, sum(opencnt) over (order by date) from (
select
Submit_Date as date,
1 as opencnt
from
ticket
union all
select
dateadd(day, 1, Close_Date),
-1
from
ticket
) TMP
There's a dateadd + 1 day to include the close date amount to that day

Answer 4

You could generate the list of dates and then retrieve the count for each date in your dateset.
The cte part generates the date list since the beginning of the year (an ssumption) and the next part calculates the count from your data set.
with cte as
(select cast('2015-01-01' as date) dt // you should change this part to the correct start date
union all
select dateadd(DD,1,dt) dt from cte
where dt<getdate()
)
select count(*)
from tickets
inner join cte
on cte.dt between Submit_Date and Close_Date
group by cte.dt