Sélectionnez Nombre maximum de groupe d'événements

Question

Le script SQL

select eventid_nbr, trunc(received_date, 'DD'), sentindicator, count(eventid_nbr) as count 
from eventlog 
where received_date between to_date('2017-07-01, 10:00 A.M.','YYYY-MM-DD, HH:MI A.M.') and to_date('2017-07-01, 11:00 A.M.','YYYY-MM-DD, HH:MI A.M.') 
group by eventid_nbr, trunc(received_date, 'DD'), sentindicator 
order by count desc, trunc(received_date, 'DD'); 

a sortie

EVENT RECEIVED_DATE SENTINDICATOR COUNT 

1  01-JUL-17  Y    128 
1  01-JUL-17  E1    2 
104 01-JUL-17  Y    55 
105 01-JUL-17  Y    4 
106 01-JUL-17  Y    3 

où j'ai besoin le nombre maximum choisi parmi chaque événement dans lequel la sortie apparaîtrait comme

EVENT RECEIVED_DATE SENTINDICATOR COUNT 

1  01-JUL-17  Y   128 
104 01-JUL-17  Y   55 
105 01-JUL-17  Y   4 
106 01-JUL-17  Y   3 

Pour chaque regroupement, aurais-je besoin de sélectionner max (nombre)? Comment pourrais-je y parvenir?

Answer 1

Dans 12c Oracle, vous pouvez faire:

select eventid_nbr, trunc(received_date, 'DD'), sentindicator, 
     count(eventid_nbr) as count 
from eventlog 
where received_date between to_date('2017-07-01, 10:00 A.M.','YYYY-MM-DD, HH:MI A.M.') and 
          to_date('2017-07-01, 11:00 A.M.','YYYY-MM-DD, HH:MI A.M.') 
group by eventid_nbr, trunc(received_date, 'DD'), sentindicator 
order by count desc, trunc(received_date, 'DD') 
fetch first 1 row only; 

Dans les versions précédentes, une sous-requête fait la même chose:

select el.* 
from (select eventid_nbr, trunc(received_date, 'DD'), sentindicator, 
      count(eventid_nbr) as count 
     from eventlog 
     where received_date between to_date('2017-07-01, 10:00 A.M.','YYYY-MM-DD, HH:MI A.M.') and 
            to_date('2017-07-01, 11:00 A.M.','YYYY-MM-DD, HH:MI A.M.') 
     group by eventid_nbr, trunc(received_date, 'DD'), sentindicator 
     order by count desc, trunc(received_date, 'DD') 
    ) el 
where rownum = 1; 

Answer 2

select eventid,dt,sentindicator,max(count) 
from 
(
    select eventid_nbr, trunc(received_date, 'DD') as dt, sentindicator, 
    count(eventid_nbr) as count 
    from eventlog 
    where received_date between to_date('2017-07-01, 10:00 A.M.','YYYY-MM-DD, 
    HH:MI A.M.') 
    and to_date('2017-07-01, 11:00 A.M.','YYYY-MM-DD, HH:MI A.M.' 
) 
    group by eventid_nbr, trunc(received_date, 'DD'), sentindicator 
    order by count desc, trunc(received_date, 'DD'))a 
group by eventid,dt,sentindicator 

Answer 3

select eventid_nbr, received_day, max(sentindicator) keep(dense_rank last order by count), max(count) as count 
from (select eventid_nbr, trunc(received_date, 'DD') as received_day, sentindicator, count(*) as count 
     from eventlog 
     where received_date between to_date('2017-07-01, 10:00 A.M.','YYYY-MM-DD, HH:MI A.M.') and to_date('2017-07-01, 11:00 A.M.','YYYY-MM-DD, HH:MI A.M.') 
     group by eventid_nbr, trunc(received_date, 'DD'), sentindicator) 
group by eventid_nbr, received_day 
order by 4 desc, received_day;