pl/sql 取小时
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and to_char(kpi.PERIOD_START_TIME,'hh24') >= '13'
and to_char(kpi.PERIOD_START_TIME,'hh24') = '19'
and to_char(kpi.PERIOD_START_TIME,'hh24') = '19' and to_char(kpi.PERIOD_START_TIME,'hh24') = '2' and
to_char(kpi.PERIOD_START_TIME,'hh24') ) ,count(*) from as s group by DATEPART ( hour,) ;
--------考虑IP重复问题-----------
select hournum,count(*) from (select DATEPART ( hour,) as hournum, from ) group by hournum
假若还要考虑某一天，那便加上where子句限定日期
and to_char(kpi.PERIOD_START_TIME,'hh24') = '19'
and to_char(kpi.PERIOD_START_TIME,'hh24') = '19' and to_char(kpi.PERIOD_START_TIME,'hh24') = '2' and
to_char(kpi.PERIOD_START_TIME,'hh24') ) ,count(*) from as s group by DATEPART ( hour,) ;
--------考虑IP重复问题-----------
select hournum,count(*) from (select DATEPART ( hour,) as hournum, from ) group by hournum
假若还要考虑某一天，那便加上where子句限定日期
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