Aircraft maximum amount in the simultaneously air - give the arrival and departuetime
Hello!
I use oracle 11g and I have a SQL Server table with a field of flight (flightNo) and two datetime fields (Departuredatetime, Arrivaldatetime).
How is it possible to query the aircraft max amout in the simultaneously in the air in a certain timeperiode? result should provide the maximum datetime value also.
Example:
flight55: | |
flight67: |--------------------|
flight69: |
flight88: |-----------|
result:
Timestamp of aircraft
09:34 3
Sorry I can't provide an insert because I am a beginner and I have only read access to the database.
Thank you very much!
Hello
The above will tell you how many planes were in the air at given times.
If you want to know the maximum number of aircraft was in the air, and when that occurred, without giving any time, here's a way to do it:
WITH got_in_air_cnt AS
(
SELECT Start_time
, (Start_time) ahead OF (ORDER BY start_time) AS end_time
SUM (SUM (net_change))
COURSES (ORDER BY start_time) AS in_air_cnt
Flights
UNPIVOT (start_time
FOR net_change (DEPARTURE AS 1
arrived as THAT-1
)
)
GROUP BY start_time
)
got_rnk AS
(
SELECT a.*
, EVALUATE () OVER (ORDER BY in_air_cnt DESC) AS rnk
OF got_in_air_cnt one
)
SELECT the value of start_time, end_time, in_air_cnt
OF got_rnk
WHERE rnk = 1
ORDER BY start_time
;
Tags: Database
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