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* date - date returns integer?
@ 2005-03-04 20:59 Andrew Hammond <ahammond@ca.afilias.info>
0 siblings, 2 replies; 3+ messages in thread
From: Andrew Hammond @ 2005-03-04 20:59 UTC (permalink / raw)
To: pgsql-sql
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Should date - date return type integer, not interval?
/* ahammond@test:5432/test =# */ SELECT ('2005-03-04'::timestamp -
'2005-01-01'::date)::interval;
~ interval
- ----------
~ 62 days
(1 row)
/* ahammond@test:5432/test =# */ SELECT ('2005-03-04'::date -
'2005-01-01'::date)::interval;
ERROR: cannot cast type integer to interval
- --
Andrew Hammond 416-673-4138 ahammond@ca.afilias.info
Database Administrator, Afilias Canada Corp.
CB83 2838 4B67 D40F D086 3568 81FC E7E5 27AF 4A9A
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^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: date - date returns integer?
@ 2005-03-04 21:54 Bruno Wolff III <bruno@wolff.to>
parent: Andrew Hammond <ahammond@ca.afilias.info>
1 sibling, 0 replies; 3+ messages in thread
From: Bruno Wolff III @ 2005-03-04 21:54 UTC (permalink / raw)
To: Andrew Hammond <ahammond@ca.afilias.info>; +Cc: pgsql-sql
On Fri, Mar 04, 2005 at 15:59:02 -0500,
Andrew Hammond <ahammond@ca.afilias.info> wrote:
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> Should date - date return type integer, not interval?
Yes. This is in the documentation.
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: date - date returns integer?
@ 2005-03-05 04:36 Tom Lane <tgl@sss.pgh.pa.us>
parent: Andrew Hammond <ahammond@ca.afilias.info>
1 sibling, 0 replies; 3+ messages in thread
From: Tom Lane @ 2005-03-05 04:36 UTC (permalink / raw)
To: Andrew Hammond <ahammond@ca.afilias.info>; +Cc: pgsql-sql
Andrew Hammond <ahammond@ca.afilias.info> writes:
> Should date - date return type integer, not interval?
If we made it return interval then there would be all sorts of timezone
dependencies introduced (think about DST crossings) ... which is
generally something you don't want to think about when doing date
arithmetic. I think the definitions of these operators are fine.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
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2005-03-04 20:59 date - date returns integer? Andrew Hammond <ahammond@ca.afilias.info>
2005-03-04 21:54 ` Bruno Wolff III <bruno@wolff.to>
2005-03-05 04:36 ` Tom Lane <tgl@sss.pgh.pa.us>
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