How to select statistics table counting occurrences between two dates - sql

Question

I need to count occurrences of protocol violations and durations between 2 dates from table to achieve effect like statistics table which will look like at the picture below:
Expected effect:
Explanation:
As you can see I need to select 'Country', 'Site' existing in Violations table and: 'Numbers', 'Maximum', 'Minimum' and 'Mean' of protocol violations duration existing in DB in the same table 'Violations' between two dates. So we have to count:
protocol violations occurrences existing in Violations table by country and site
min/max/avg durations of protocol violations by country and site
under two different conditions:
occurrences from Date Discovered to Date Reported
occurrences from Date Reported to Date Confirmed
Database Structure:
Available at SQLFILDDLE: Look HERE
I will add that code in attached SQLFIDDLE has more tables and an query but they are unnecessary right now for this problem. Feel free to use it.
I didn't remove old query because there is nice way to do:
'- All -' and
'- Unknown -' values. -
Violation table:
create table violations (
id long,
country varchar(20),
site varchar(20),
status_id int,
trial_id int,
discovered_date date,
reporded_date date,
confirmed_date date
);
Site table:
create table site (
id long,
site varchar(20)
);
My First try:
Here is my new SQLFIDDLE with query needed to improve commented lines:
SELECT v.country as country, v.site as site,
COUNT(*) as N --,
--MAX(list of durations in days between discovered date to repored date on each violation by country and site) as "Maximum",
--MIN(list of durations in days between discovered date to repored date on each violation by country and site) as "Minimum",
--AVG(list of durations in days between discovered date to repored date on each violation by country and site) as "Mean"
FROM violations v
WHERE v.trial_id = 3
GROUP BY ROLLUP (v.country, v.site)
I've managed to create abstract query with my idea. But I have a problem to write correct query for MAX, MIN and AVG where we must select max/min/avg value from list of durations in days between discovered date to reported date on each violation by country and site.
Could you help me please?

Answer 1

Please check this query. It is simplified and may give you an idea and direction. If you need more then this then let me know. Copy and paste to see results. This query will select and calc only the results between two dates in where clause. You need to run inner query first w/out where to see all dates etc... This query counts violations between 2 dates. Not sure what is the list of duration in days... See below for count of duration. You may add MAX/MIN etc...
-- Days between (duration) = (end_date-start_date) = number of days (number) --
SELECT (to_date('14-MAR-2013') - to_date('01-MAR-2013')) days_between
FROM dual
/
SELECT country, site
, Count(*) total_viol
, MAX(susp_viol) max_susp_viol
, MIN(susp_viol) min_susp_viol
FROM
(
SELECT 'GERMANY' country, '12222' site, 1 susp_viol, 2 conf_viol, trunc(Sysdate-30) disc_date, trunc(Sysdate-25) conf_date
FROM dual
UNION
SELECT 'GERMANY', '12222' , 3 , 14, trunc(Sysdate-20) , trunc(Sysdate-15) FROM dual
UNION
SELECT 'GERMANY', '12222' , 6 , 25, trunc(Sysdate-20) , trunc(Sysdate-15) FROM dual
UNION
SELECT 'GERMANY', '12222' , 2 , 1, trunc(Sysdate-20) , trunc(Sysdate-15) FROM dual
UNION
SELECT 'GERMANY', '13333' , 10 , 5, trunc(Sysdate-15) , trunc(Sysdate-10) FROM dual
UNION
SELECT 'GERMANY', '13333' , 15 , 3, trunc(Sysdate-15) , trunc(Sysdate-10) FROM dual
UNION
SELECT 'GERMANY', 'Unknown Site' , 0 , 7, trunc(Sysdate-5) , trunc(Sysdate-2) FROM dual
UNION
SELECT 'RUSSIA', '12345' , 1 , 5, trunc(Sysdate-20) , trunc(Sysdate-15) FROM dual
UNION
SELECT 'RUSSIA', '12345' , 2 , 10, trunc(Sysdate-15) , trunc(Sysdate-12) FROM dual
UNION
SELECT 'RUSSIA', 'Unknown Site' , 10 , 10, trunc(Sysdate-3) , trunc(Sysdate-1) FROM dual
)
-- replace sysdate with your_date-default format is to_date('14-MAR-2013') or give format mask
WHERE conf_date BETWEEN trunc(Sysdate-20) AND trunc(Sysdate-10)
GROUP BY ROLLUP (country, site)
ORDER BY country, site
/
Count of duration:
SELECT country, site, (conf_date-disc_date) duration, count(*) total_durations
FROM
(
SELECT 'GERMANY' country, '12222' site, 1 susp_viol, 2 conf_viol, trunc(Sysdate-30) disc_date, trunc(Sysdate-20) conf_date
FROM dual
UNION
SELECT 'GERMANY', '12222' , 3 , 14, trunc(Sysdate-20) , trunc(Sysdate-12) FROM dual
UNION
SELECT 'GERMANY', '12222' , 6 , 25, trunc(Sysdate-20) , trunc(Sysdate-12) FROM dual
UNION
SELECT 'GERMANY', '12222' , 2 , 1, trunc(Sysdate-20) , trunc(Sysdate-12) FROM dual
UNION
SELECT 'GERMANY', '13333' , 10 , 5, trunc(Sysdate-12) , trunc(Sysdate-6) FROM dual
UNION
SELECT 'GERMANY', '13333' , 15 , 3, trunc(Sysdate-17) , trunc(Sysdate-11) FROM dual
UNION
SELECT 'GERMANY', 'Unknown Site' , 0 , 7, trunc(Sysdate-5) , trunc(Sysdate-2) FROM dual
UNION
SELECT 'RUSSIA', '12345' , 1 , 5, trunc(Sysdate-20) , trunc(Sysdate-15) FROM dual
UNION
SELECT 'RUSSIA', '12345' , 2 , 10, trunc(Sysdate-15) , trunc(Sysdate-12) FROM dual
UNION
SELECT 'RUSSIA', 'Unknown Site' , 10 , 10, trunc(Sysdate-3) , trunc(Sysdate-1) FROM dual
)
WHERE conf_date BETWEEN trunc(Sysdate-20) AND trunc(Sysdate-10)
GROUP BY ROLLUP (country, site, (conf_date-disc_date))
ORDER BY country, site
/