Oracle SQL to find sum of difference of date by Group - sql

Question

I am trying to find a total duration consume by a Group by calculating date difference in a following query
with event AS (
SELECT 9000 AS ID, TO_DATE('2018-03-01 09:00:00','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9000 AS ID, TO_DATE('2018-03/10 10:00:00','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'END' AS EVENT FROM DUAL UNION ALL
SELECT 9001 AS ID, TO_DATE('2018-03-10 11:00:00','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9001 AS ID, TO_DATE('2018-03/20 10:00:00','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'END' AS EVENT FROM DUAL UNION ALL
SELECT 9000 AS ID, TO_DATE('2018-03-20 10:05:00','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9000 AS ID, TO_DATE('2018-03/25 09:00:00','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'END' AS EVENT FROM DUAL UNION ALL
SELECT 9001 AS ID, TO_DATE('2018-03-25 10:15:00','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9001 AS ID, TO_DATE('2018-03/26 12:00:00','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'END' AS EVENT FROM DUAL UNION ALL
SELECT 9002 AS ID, TO_DATE('2017-03-26 14:30:27','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9002 AS ID, TO_DATE('2017-04-05 15:02:56','RRRR-MM-DD HH24:MI:SS') AS
TIMESTAMP, 'END' AS EVENT FROM DUAL
)
select id, min(timestamp) as call_start_ts, max(timestamp) as call_end_ts,
max(timestamp) - min(timestamp) as duration
from event t
group by id
order by 1;
I have also configure the SQLFiddle
Please help me
EDIT
Expected Result will be like below

Answer 1

Use the LAG or LEAD analytic functions to get the next END event's time:
SQL Fiddle
Oracle 11g R2 Schema Setup:
CREATE TABLE event ( id, timestamp, event ) AS
SELECT 9000, TO_DATE('2018-03-01 09:00:00','RRRR-MM-DD HH24:MI:SS'), 'Start' FROM DUAL UNION ALL
SELECT 9000, TO_DATE('2018-03/10 10:00:00','RRRR-MM-DD HH24:MI:SS'), 'END' FROM DUAL UNION ALL
SELECT 9001, TO_DATE('2018-03-10 11:00:00','RRRR-MM-DD HH24:MI:SS'), 'Start' FROM DUAL UNION ALL
SELECT 9001, TO_DATE('2018-03/20 10:00:00','RRRR-MM-DD HH24:MI:SS'), 'END' FROM DUAL UNION ALL
SELECT 9000, TO_DATE('2018-03-20 10:05:00','RRRR-MM-DD HH24:MI:SS'), 'Start' FROM DUAL UNION ALL
SELECT 9000, TO_DATE('2018-03/25 09:00:00','RRRR-MM-DD HH24:MI:SS'), 'END' FROM DUAL UNION ALL
SELECT 9001, TO_DATE('2018-03-25 10:15:00','RRRR-MM-DD HH24:MI:SS'), 'Start' FROM DUAL UNION ALL
SELECT 9001, TO_DATE('2018-03/26 12:00:00','RRRR-MM-DD HH24:MI:SS'), 'END' FROM DUAL UNION ALL
SELECT 9002, TO_DATE('2017-03-26 14:30:27','RRRR-MM-DD HH24:MI:SS'), 'Start' FROM DUAL UNION ALL
SELECT 9002, TO_DATE('2017-04-05 15:02:56','RRRR-MM-DD HH24:MI:SS'), 'END' FROM DUAL;
Query 1:
SELECT id,
MIN( timestamp ) AS start_ts,
MAX( end_time ) AS end_ts,
SUM( end_time - timestamp ) AS duration
FROM (
SELECT id,
timestamp,
event,
LEAD( CASE event WHEN 'END' THEN timestamp END )
OVER ( PARTITION BY id ORDER BY timestamp ) AS end_time
FROM event
)
WHERE event = 'Start'
GROUP BY id
ORDER BY id
Results:
| ID | START_TS | END_TS | DURATION |
|------|----------------------|----------------------|--------------------|
| 9000 | 2018-03-01T09:00:00Z | 2018-03-25T09:00:00Z | 13.996527777777779 |
| 9001 | 2018-03-10T11:00:00Z | 2018-03-26T12:00:00Z | 11.03125 |
| 9002 | 2017-03-26T14:30:27Z | 2017-04-05T15:02:56Z | 10.02255787037037 |

Answer 2

I solved the problem in two steps. First i match records in the same interval then i sum up their duration.
http://sqlfiddle.com/#!4/73f48/83
SELECT
Id,
round(SUM(duration))
FROM
(
SELECT
t.id,
MIN (t2. TIMESTAMP) - t. TIMESTAMP AS duration
FROM
event t,
event t2
WHERE
t.Id = t2.Id
AND t2.Event = 'END'
AND t.Event = 'Start'
AND t2. TIMESTAMP > t. TIMESTAMP
GROUP BY
t. TIMESTAMP,
t.Id
)
GROUP BY
Id

Answer 3

select
id, round(sum(end_timestamp - start_timestamp),3) DURATION
from (
select
t.id,
t.timestamp START_TIMESTAMP,
case when LEAD(t.event,1) OVER (partition by id order by timestamp, event desc) = 'END'
then LEAD(t.timestamp,1) OVER (partition by id order by timestamp, event desc)
else null end as END_TIMESTAMP
from event t
)tt
where end_timestamp is not null
group by id

Answer 4

Solution to your problem:
WITH event AS (
SELECT 9000 AS ID, TO_DATE('2018-03-01 09:00:00','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9000 AS ID, TO_DATE('2018-03/10 10:00:00','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'END' AS EVENT FROM DUAL UNION ALL
SELECT 9001 AS ID, TO_DATE('2018-03-10 11:00:00','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9001 AS ID, TO_DATE('2018-03/20 10:00:00','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'END' AS EVENT FROM DUAL UNION ALL
SELECT 9000 AS ID, TO_DATE('2018-03-20 10:05:00','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9000 AS ID, TO_DATE('2018-03/25 09:00:00','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'END' AS EVENT FROM DUAL UNION ALL
SELECT 9001 AS ID, TO_DATE('2018-03-25 10:15:00','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9001 AS ID, TO_DATE('2018-03/26 12:00:00','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'END' AS EVENT FROM DUAL UNION ALL
SELECT 9002 AS ID, TO_DATE('2017-03-26 14:30:27','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'Start' AS EVENT FROM DUAL UNION ALL
SELECT 9002 AS ID, TO_DATE('2017-04-05 15:02:56','RRRR-MM-DD HH24:MI:SS') AS TIMESTAMP, 'END' AS EVENT FROM DUAL
)
,rn_event AS
(
select event.*,ROW_NUMBER() OVER (Partition BY ID ORDER BY TimeSTAMP) AS rn from event
)
, diff_event AS
(
SELECT e.ID, f.TIMESTAMP AS Start_time, e.timestamp AS End_Time, e.TIMESTAMP - f.timestamp AS duration
FROM rn_event e
INNER JOIN rn_event f
ON f.id = e.id AND f.EVENT = 'Start' AND f.rn = e.rn - 1
)
SELECT ID,MIN(Start_Time) START_TS, MAX(END_TIME) END_TS, ROUND(SUM(Duration)) AS Duration
FROM diff_event
GROUP BY ID;
OUTPUT:
ID START_TS END_TS DURATION
9000 2018-03-01T09:00:00Z 2018-03-25T09:00:00Z 14
9001 2018-03-10T11:00:00Z 2018-03-26T12:00:00Z 11
9002 2017-03-26T14:30:27Z 2017-04-05T15:02:56Z 10
A demo for the above query:
http://sqlfiddle.com/#!4/73f48/87