Re: extracting total amount of time from an interval

In response to Andrew Geery :
> Is there a way to extract the total amount of time in a given unit from an
> interval?  For example, I would like to know the total number of milliseconds
> in an interval.
>
> The expression
>
> select extract('seconds' from '5 minutes'::interval)
>
> returns the value of the seconds field (0) in the interval; not the total
> number of seconds in the interval.  Is there a function like extract, but which
> extracts the value not *from* the given field, but *in* the given units (the
> opposite of the justify* functions)?

You can use extract:

test=*# select extract(epoch from '5 minutes'::interval);
date_part
-----------
300

Regards, Andreas
--
Andreas Kretschmer
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