Oracle query that count connections by minute with start and end times provided
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to_date(‘20150106 00:00:00‘ , ‘yyyy-mm-dd hh24:mi:ss‘) +
numtodsinterval (level , ‘minute‘) dt
FROM dual
CONNECT BY level <= 24 * 60
2、左外连接，条件 dt >= begin and dt < end + 1
3、需要截取t.begin 和 t.end到分钟
对于begin , trunc(begin,‘mi‘)
对于end , trunc(end+ numtodsinterval(1, ‘minute‘),‘mi‘)) // trunc( end + 1 ,[format])
4、按分钟聚合统计
结果
WITH each_minute AS
( SELECT to_date( ‘20150106 00:00:00‘ , ‘yyyy-mm-dd hh24:mi:ss‘ ) +
numtodsinterval (level , ‘minute‘) dt
FROM dual
CONNECT BY level <= 24 * 60 )
SELECT trunc (em.dt, ‘mi‘) d, count (t.n) cnt
FROM each_minute em
LEFT OUTER JOIN t
ON (em.dt >= trunc (t.b, ‘mi‘) AND em.dt < trunc (t.e+ numtodsinterval (1 , ‘minute‘), ‘mi‘ ))
group by trunc(em.dt, ‘mi‘ )
order by 1;
简单测试
SQL> WITH each_minute AS2 (SELECT to_date(‘20150106 00:00:00‘, ‘yyyy-mm-dd hh24:mi:ss‘) +
3 numtodsinterval(level, ‘minute‘) dt
4 FROM dual
5 CONNECT BY level <= 24 * 60)
6 SELECT trunc(em.dt, ‘mi‘) d, count(t.n) cnt
7 FROM each_minute em
8 LEFT OUTER JOIN t
9 ON (em.dt >= trunc(t.b, ‘mi‘) AND
10 em.dt < trunc(t.e + numtodsinterval(1, ‘minute‘), ‘mi‘))
11 where t.n is not null -- no need for 1440,just for test.
12 group by trunc(em.dt, ‘mi‘)
13 order by 1;
D CNT
----------------- ----------
20150106 01:00:00 3
20150106 02:00:00 1
20150106 02:01:00 1
Oracle query that count connections by minute with start and end times provided
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本文系统来源：http://www.cnblogs.com/syksky/p/oracle.html
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