oracle - Days between two dates -

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I appreciate that it has been asked many times earlier, but by reading through them I was unable to find a solution for it. I want to be

It is quite easy. I want to calculate the number of days that are between two dates, which use an oracle function.

Date_details and date-links are two reputable days. But I have to put it in a package at the end of the day which I think I can do, I'm struggling with the function.

Would anyone be able to give me a structure for this so that I can assemble the function used in my package? I'm still a newbie with Oracle features.

Just like this: 

  SELECT Trunc (t.date1 - T.date2) in the form of days from my tables

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