Oracle數(shù)據(jù)按小時(shí)分組的語句

創(chuàng)建測試表，隨便弄了點(diǎn)數(shù)據(jù)：

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create?table?test

(timestamp?date);

insert?into?test?values?(to_date('2017-12-7?9:00:00','yyyy-mm-dd?hh24:mi:ss'));

insert?into?test?values?(to_date('2017-12-7?9:01:00','yyyy-mm-dd?hh24:mi:ss'));

insert?into?test?values?(to_date('2017-12-7?11:00:00','yyyy-mm-dd?hh24:mi:ss'));

insert?into?test?values?(to_date('2017-12-7?11:20:00','yyyy-mm-dd?hh24:mi:ss'));

insert?into?test?values?(to_date('2017-12-7?11:30:00','yyyy-mm-dd?hh24:mi:ss'));

commit;

執(zhí)行：

select?to_char(timestamp,'yyyy-mm-dd?hh24')||':00:00',count(*)?from?test?group?by?to_char(timestamp,'yyyy-mm-dd?hh24')||':00:00'

結(jié)果：

只針對時(shí)間字段為date類型有效，其他類型的話需要改語句。

oracle按小時(shí)分組查詢

select

decode(tl, '00:00——00:30', to_char(a-1,'yyyymmdd'), to_char(a,'yyyymmdd')) as 天,

decode(tl, '00:00——00:30', '16:31——00:30', '16:31——00:00', '16:31——00:30', t1) as 時(shí)間段,

sum(b)

from

(

select

a,

case

when to_char(a, 'hhmi') ='0030' then '00:00——00:30'

when to_char(a, 'hhmi') between '0031' and '0830' then '00:30——08:30'

when to_char(a, 'hhmi') between '0031' and '1630' then '00:31——16:30'

when to_char(a, 'hhmi') = '1631' then '16:31——00:00'

else ''

end as tl,

b

from table_name

)

group by

decode(tl, '00:00——00:30', to_char(a-1,'yyyymmdd'), to_char(a,'yyyymmdd')),

decode(tl, '00:00——00:30', '16:31——00:30', '16:31——00:00', '16:31——00:30', t1)

oracle中怎么按每小時(shí)分組。數(shù)據(jù)如下：

select time,count(time) from (

select substr('2014-01-01 20:03:00',1,13) as time from table_name) group by time;