I need some help. I am trying to replicate a function from Sybase ASA, and am having difficulty.
I need to be able to subtract 2 date (or timestamps) and return the results expressed in days, weeks, month, quarters, or years. How do I do this?
I believe Postgres is returning the number of days when you subtract to days.
i.e. postgres=# select current_date - '2007/01/01';
?column?
----------
200
(1 row)
However, I can not figure out how to get the results expressed as 7 months, or 2 quarters, x weeks, or 0 years. I have tried to use date_part, but since the subtraction is returning an integer, it is not happy.
Any help would be greatly appreciated.
Chris
P.S.
I'm trying to replicate Sybase's datediff function.
