Working out elapsed time from two columns in ORACLE SQL [duplicate]

Question

This question already has answers here:

Calculate difference between 2 date / times in Oracle SQL (20 answers)

Closed 8 years ago.

I have two rows stored in a table called client_booking. These are called start_time and end_time. I need to create a text box in ORACLE APEX which generates the elapsed time through an SQL query.

Answer 1

Time difference being in days, let us multiply it by no of hours 24 and no of minutes 60. Assuming they are of DATE or TIMESTAMP datatypes

select (
         to_date('01-01-2014 '|| end_time  ||'00','DD-MM-YYYY HHMISS') -
         to_date('01-01-2014 '|| start_time||'00','DD-MM-YYYY HHMISS')
       ) * 24 * 60 as time_elapsed_in_mins
from your_table;