sql - Group price by hour -


i have data this

dt                 | price --------------------------- 2016-02-02 12:33:33  3.3 2016-03-02 12:33:33  3.3 2016-02-02 12:03:33  3.3 2016-02-02 12:50:33  3.3 2016-02-02 13:33:33  3.3

i need summed price grouped hour, though need include year, month , day parts also

desirable result:

2016-02-02 12:00:00  9.9 2016-02-02 13:00:00  3.3 2016-03-02 12:00:00  3.3

i have query, gives result. question is, may there more efficient way this?

my current query:

select to_timestamp(d, 'yyyy-mm-dd hh24:mi:ss') hours, price (     select substr(dt, 1, 13) d, sum(price) price table     group substr(dt, 1, 13) )  order hours

try this

select trunc(dt,'hh24'), sum(price) table group trunc(dt,'hh24') order 2 desc;

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