SQL grouping on time interval - sql

Question

I have a data set which is based on a timestamp. The Data set present record on every shut down occurrence in a 5 minute time interval. If a shut down occurred in the specific 5 min, then the record is added else no record. Thus no record means system has recovered
Date
07-Jul-15 12:05:00
07-Jul-15 12:10:00
07-Jul-15 12:15:00
07-Jul-15 12:35:00
07-Jul-15 12:40:00
07-Jul-15 12:45:00
07-Jul-15 12:50:00
07-Jul-15 13:05:00
07-Jul-15 13:10:00
07-Jul-15 13:15:00
I would like to query and return
1.Number of shutdowns: The Number of shut down in this case is 3 based on between
12:15 to 12:35
12:50 to 13:05
The system recovered
Period Between every shut down
Example:
1.From: 07-Jul-15 12:05:00 To: 07-Jul-15 12:15:00 Duration : 15 Mins
2.From: 07-Jul-15 12:35:00 To: 07-Jul-15 12:50:00 Duration : 20 Mins
There is a similar Question although a very different solution is required for this one.
would appreciate a fiddle example

Answer 1

WITH changes AS (
SELECT "DATE",
CASE WHEN LAG( "DATE" ) OVER ( ORDER BY "DATE" ) + INTERVAL '5' MINUTE = "DATE" THEN 0 ELSE 1 END AS has_changed_group
FROM TEST
), grps AS (
SELECT "DATE",
SUM( has_changed_group ) OVER ( ORDER BY "DATE" ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ) AS grp
FROM changes
)
SELECT MIN( "DATE" ) AS shutdown_start,
MAX( "DATE" ) AS shutdown_end,
MAX( "DATE" ) - MIN( "DATE" ) + INTERVAL '5' MINUTE AS shutdown_duration
FROM grps
GROUP BY grp;
Output:
SHUTDOWN_START SHUTDOWN_END SHUTDOWN_DURATION
---------------------------- ---------------------------- -----------------
07-JUL-15 12.05.00.000000000 07-JUL-15 12.15.00.000000000 0 0:15:0.0
07-JUL-15 12.35.00.000000000 07-JUL-15 12.50.00.000000000 0 0:20:0.0
07-JUL-15 13.05.00.000000000 07-JUL-15 13.15.00.000000000 0 0:15:0.0
Edit - Multiple machines:
SQL Fiddle
Oracle 11g R2 Schema Setup:
CREATE TABLE TEST ( MACHINE_ID, "DATE" ) AS
SELECT 1, TIMESTAMP '2015-07-07 12:05:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 12:10:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 12:15:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 12:35:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 12:40:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 12:45:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 12:50:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 13:05:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 13:10:00' FROM DUAL
UNION ALL SELECT 1, TIMESTAMP '2015-07-07 13:15:00' FROM DUAL
UNION ALL SELECT 2, TIMESTAMP '2015-07-07 12:35:00' FROM DUAL
UNION ALL SELECT 2, TIMESTAMP '2015-07-07 12:40:00' FROM DUAL
UNION ALL SELECT 2, TIMESTAMP '2015-07-07 12:45:00' FROM DUAL
UNION ALL SELECT 2, TIMESTAMP '2015-07-07 13:00:00' FROM DUAL
UNION ALL SELECT 2, TIMESTAMP '2015-07-07 13:05:00' FROM DUAL
UNION ALL SELECT 2, TIMESTAMP '2015-07-07 13:10:00' FROM DUAL
UNION ALL SELECT 2, TIMESTAMP '2015-07-07 13:15:00' FROM DUAL;
Query 1:
WITH changes AS (
SELECT MACHINE_ID,
"DATE",
CASE WHEN LAG( "DATE" ) OVER ( PARTITION BY MACHINE_ID ORDER BY "DATE" ) + INTERVAL '5' MINUTE = "DATE" THEN 0 ELSE 1 END AS has_changed_group
FROM TEST
), grps AS (
SELECT MACHINE_ID,
"DATE",
SUM( has_changed_group ) OVER ( PARTITION BY MACHINE_ID ORDER BY "DATE" ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW ) AS grp
FROM changes
)
SELECT MACHINE_ID,
TO_CHAR( MIN( "DATE" ), 'YYYY-MM-DD HH24:MI:SS' ) AS shutdown_start,
TO_CHAR( MAX( "DATE" ), 'YYYY-MM-DD HH24:MI:SS' ) AS shutdown_end,
TO_CHAR( MAX( "DATE" ) - MIN( "DATE" ) + INTERVAL '5' MINUTE ) AS shutdown_duration
FROM grps
GROUP BY MACHINE_ID, grp
ORDER BY 1,2
Results:
| MACHINE_ID | SHUTDOWN_START | SHUTDOWN_END | SHUTDOWN_DURATION |
|------------|---------------------|---------------------|-------------------------------|
| 1 | 2015-07-07 12:05:00 | 2015-07-07 12:15:00 | +000000000 00:15:00.000000000 |
| 1 | 2015-07-07 12:35:00 | 2015-07-07 12:50:00 | +000000000 00:20:00.000000000 |
| 1 | 2015-07-07 13:05:00 | 2015-07-07 13:15:00 | +000000000 00:15:00.000000000 |
| 2 | 2015-07-07 12:35:00 | 2015-07-07 12:45:00 | +000000000 00:15:00.000000000 |
| 2 | 2015-07-07 13:00:00 | 2015-07-07 13:15:00 | +000000000 00:20:00.000000000 |

Answer 2

Solution using Tom Kyte's "carry down" technique:
with test1 as (
select mydate,
-- mark starting records in each group
case when NVL((mydate - lag(mydate) over (order by mydate))*24*60,10) > 5
then row_number() over (order by mydate) end as group_id
from test),
test2 as (
select mydate,
-- propagate group_id to all records
LAST_VALUE(group_id IGNORE NULLS) over (order by mydate) as group_id
from test1)
select min(mydate) shutdown_from, max(mydate) shutdown_to
from test2
group by group_id;
Output
SHUTDOWN_FROM SHUTDOWN_TO
------------------- -------------------
07.07.0015 12:05:00 07.07.0015 12:15:00
07.07.0015 12:35:00 07.07.0015 12:50:00
07.07.0015 13:05:00 07.07.0015 13:15:00