的SQL腳本選擇最大計數自組活動
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');
具有輸出
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
因此我需要選擇每一個事件當中最大計數,從而輸出將顯示爲
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
對於每個分組,我是否需要選擇max(count)?我怎麼能做到這一點?
我已經更新說明我的問題需要選擇與事件1相同的包含重複項的所有事件(可能是200),並且只包含那些列COUNT爲MAX(COUNT)的元組。對於非重複事件,例如104,105和106,它們的元組包含在結果集中,因此它們的計數已經是最大值(COUNT) – Mushy