Oracle, split a time duration row by one hour period

Question

I\'m working on oracle db and I\'m not quite good at Oracle. I\'m trying to split a row by one hour period.

For example, if a time row has given as below,

St

Answer 1

I have bulit a basic query, you can work around it and get what you want.

select greatest(Start_time, trunc(Start_time+(level-1)/24, 'hh24')), 
least(End_time, trunc(Start_time+(level)/24, 'hh24'))
from log_table 
connect by level <= floor((dt1-dt2)*24)+1;

Example at sqlfiddle:

http://sqlfiddle.com/#!4/82625/29