| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Luke McFarlane <luke(at)fisheye(dot)com(dot)au> |
| Cc: | pgsql-bugs <pgsql-bugs(at)postgresql(dot)org> |
| Subject: | Re: Time intervals in select statement |
| Date: | 2004-10-19 13:56:08 |
| Message-ID: | 15348.1098194168@sss.pgh.pa.us |
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| Lists: | pgsql-bugs |
Luke McFarlane <luke(at)fisheye(dot)com(dot)au> writes:
> It's interesting why addition assumes one operand is interval while
> subtraction assumes it is timestamp? It should at least be consistent, IMHO.
There is no timestamp + timestamp operator, for reasons that should be
fairly apparent. There are both timestamp - timestamp (yielding interval)
and timestamp - interval (yielding timestamp), and in case of ambiguity
the preferred interpretation is the one with the same datatype on both
sides. See
http://www.postgresql.org/docs/7.4/static/typeconv-oper.html
regards, tom lane
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