Find all the lines from the previous column value difference lines
I have an interesting requirement. There is a DATE column and a user in one table and I have to find all the lines for all users for which the previous and the current line has lagged in lets say more than 30 minutes. The rows are already sorted in time.For example in the following table, we need to ID 4 and 6 for user 1.
Date of the user ID
1 1 today 1 hr. 0 Min. 0 sec.
today 2 1 1 hour 1 min 0 sec
Today 3 1 1 hour 29 min 0 s
* 4-1 today 1 hour 59 min 3s *.
5 1 today 2 hours 10 min 2 sec
* 6 1 today 2 hours 50 min 7 s *.
Published by: user733179 on March 5, 2009 12:00
Hello
To obtain a separate calculation for each value of the usr, start the analytical clause with "BY usr PARTITION":
WITH got_dif AS
(
SELECT id, dt, usr
, (dt - LAG (dt)
OVER ( PARTITION BY usr
ORDER BY dt
)
) -- difference in days
* 24 * 60 AS minutes_dif
FROM table_x
-- WHERE ... -- if needed
)
SELECT id, dt, usr
FROM got_dif
WHERE minutes_dif > 30
;
Tags: Database
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