Insert one row per hour between two date time range including duration (Oracle) - oracle11g

Question

I have two date time records "start_date" and "end_date" from date_range table.
I would like to insert one row per hour for each hour interval, plus a column with the duration (in hours) so that my results return as follows:
e.g. start_date = 2016/09/01 21:12:00 and end_date = 2016/09/02 01:30:00
Date Hour Duration
2016/09/01 21 0.8
2016/09/01 22 1
2016/09/01 23 1
2016/09/02 00 1
2016/09/02 01 0.5

Answer 1

Here is a plain SQL solution (best to avoid PL/SQL when possible and not too complicated). It uses a recursive factored subquery, available since Oracle 11.1. I created several "rows" of test data to show how this might work for more than one pair of inputs at the same time. Please note, the first subquery is not part of the solution - you would replace it (and the references to it in the actual solution, which is the rest of the query) with your actual table and column names, or whatever your input source.
Note also that "date" and "hour" are reserved words in Oracle, and they shouldn't be used as column names (in the output or anywhere else). I used dt and hr instead.
with
date_range ( row_id, start_date, end_date ) as (
select 101, to_date('2016/09/01 21:12:00', 'yyyy/mm/dd hh24:mi:ss'),
to_date('2016/09/02 01:30:00', 'yyyy/mm/dd hh24:mi:ss') from dual union all
select 102, to_date('2016/09/02 21:00:00', 'yyyy/mm/dd hh24:mi:ss'),
to_date('2016/09/02 22:00:00', 'yyyy/mm/dd hh24:mi:ss') from dual union all
select 103, to_date('2016/09/01 15:00:00', 'yyyy/mm/dd hh24:mi:ss'),
to_date('2016/09/01 15:30:00', 'yyyy/mm/dd hh24:mi:ss') from dual union all
select 104, to_date('2016/09/01 21:12:00', 'yyyy/mm/dd hh24:mi:ss'),
to_date('2016/09/01 21:30:00', 'yyyy/mm/dd hh24:mi:ss') from dual
),
rec ( row_id, from_time, to_time, end_date ) as (
select row_id, start_date,
least(end_date, trunc(start_date, 'hh') + 1/24), end_date
from date_range
union all
select row_id, to_time, least(end_date, to_time + 1/24), end_date
from rec
where end_date > from_time + 1/24
)
select row_id,
to_char(from_time, 'yyyy/mm/dd') as dt,
to_char(from_time, 'hh24') as hr,
round(24 * (to_time - from_time), 2) as duration
from rec
order by row_id, from_time
;
Output:
ROW_ID DT HR DURATION
---------- ---------- -- ----------
101 2016/09/01 21 .8
101 2016/09/01 22 1
101 2016/09/01 23 1
101 2016/09/02 00 1
101 2016/09/02 01 .5
102 2016/09/02 21 1
103 2016/09/01 15 .5
104 2016/09/01 21 .3
8 rows selected

Answer 2

You can do it with procedure like this:
first I prepare your data;
create table date_range
(
start_date date,
end_date date
);
create table result_table
(
date_ varchar2(10),
hour_ varchar2(2),
duration number
);
insert into date_range
select to_date('2016/09/01 21:12:00','YYYY/MM/DD hh24:mi:ss'),to_date('2016/09/02 01:30:00','YYYY/MM/DD hh24:mi:ss') from dual ;
commit;
second I create your procedure;
CREATE OR REPLACE procedure get_dates
AS
rn number:=0;
temp varchar2(10);
BEGIN
select
ceil(24* ( end_date-start_date ))-1
into rn
from
date_range;
FOR i IN 0..rn
LOOP
temp:=i||'/24';
EXECUTE IMMEDIATE '
insert into result_table
select
to_char(start_date+'||temp||',''yyyy/mm/dd'')date_,
to_char(start_date+'||temp||',''hh24'')hour_,
case
when '||i||'=0
then 1-to_number(to_char(start_date+'||temp||',''mi''))/60
when '||i||'='||rn||'
then 1-to_number(to_char(end_date+'||temp||',''mi''))/60
else 1
end duration
from
date_range ';
commit;
END LOOP;
END get_dates;
thirdly I execute procedure ;
begin
get_dates();
end;
finally I see the expected result ;
select
* from
result_table;
DATE_ HOUR_ DURATION
2016/09/01 21 0,8
2016/09/01 22 1
2016/09/01 23 1
2016/09/02 00 1
2016/09/02 01 0,5

Answer 3

select case when lvl=mn then (trunc(frst)+1)- frst
when lvl=mx then lst-trunc(lst)
else 1
end ,a.*
from
(
select frst,lst,sonuc,lvl,first_value(lvl)over() mn,last_value(lvl) over() mx
from
(select to_date('2016/09/01 21:12:00','YYYY/MM/DD hh24:mi:ss') frst,
to_date('2016/09/02 01:30:00','YYYY/MM/DD hh24:mi:ss') lst,
(to_date('2016/09/02 01:30:00','YYYY/MM/DD hh24:mi:ss') - to_date('2016/09/01 21:12:00','YYYY/MM/DD hh24:mi:ss'))*24 sonuc from dual) a
,
( select level lvl
from dual
connect by level <=
(select
case when (to_date('2016/09/02 01:30:00','YYYY/MM/DD hh24:mi:ss') - to_date('2016/09/01 21:12:00','YYYY/MM/DD hh24:mi:ss'))*24>
trunc((to_date('2016/09/02 01:30:00','YYYY/MM/DD hh24:mi:ss') - to_date('2016/09/01 21:12:00','YYYY/MM/DD hh24:mi:ss'))*24)
then trunc((to_date('2016/09/02 01:30:00','YYYY/MM/DD hh24:mi:ss') - to_date('2016/09/01 21:12:00','YYYY/MM/DD hh24:mi:ss'))*24)+1
else trunc((to_date('2016/09/02 01:30:00','YYYY/MM/DD hh24:mi:ss') - to_date('2016/09/01 21:12:00','YYYY/MM/DD hh24:mi:ss'))*24)
end
from dual)
) b
)a