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oracle 10g api to count how many saturday/sundays within 2 date parameters

Last Modified: 2015-06-11
Guys, I don't know how to construct an api but I believe this is the best way moving forward.

I'm needing to count how many Saturdays or sundays or both that are in a "Date_From" and "Date_To" and I think an api to do this would be best.


Date_From      Date_To         Count
01/06/2015     06/01/2015       1


Date_From      Date_To         Count
01/06/2015     10/01/2015       2


Date_From      Date_To         Count
11/06/2015     25/01/2015       4

Can any body help or suggest
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