I have a table which contains 291000 records. This represents the non working hours. That includes holidays, weekends and overnight hours. Those timeframes should not be considered for a specific calculation I need to perform.

The non working hours table contains a start time and an end time.

So, basically, if I have two transactional dates in a table such as 01/10/2014 08:00:00 and 15/10/2014 17:53:24, I need to use this time table to calculate how many working hours applied between these two dates.

This is done by querying the time table and summarizing differentials.

So far, I have converted a logic from an old code. But, that is very deprecated. There has to be something better, such as a single SQL select that would be capable of returning the duration in hours and/or days.

Anyone has ever done something like that or would be able to provide a SQL select example of how you would see it?