Chris Hoover wrote:
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.
postgres=# select age(current_date,'2007/01/01');
age
----------------
6 mons 20 days
(1 row)
http://www.postgresql.org/docs/8.2/static/functions-datetime.html
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
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