| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> |
| Cc: | Eagna <eagna(at)protonmail(dot)com>, "pgsql-general(at)lists(dot)postgresql(dot)org" <pgsql-general(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: How to add a variable to a timestamp. |
| Date: | 2022-10-29 22:13:54 |
| Message-ID: | 85459.1667081634@sss.pgh.pa.us |
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| Lists: | pgsql-general |
Adrian Klaver <adrian(dot)klaver(at)aklaver(dot)com> writes:
> On 10/29/22 10:35, Eagna wrote:
>> I'm trying to do something like this.
>> '2022-10-31 00:00:00'::TIMESTAMP + INTERVAL 'd.i DAY'
That will not work. A literal is a literal, you can't expect that
the system will interpret parts of it as variable references.
> '2022-10-31 00:00:00'::TIMESTAMP + (d.i::text || ' DAY ' || h.i::text
> || ' HOUR')::interval
That'll work, but my what a kluge. More recommendable is
'2022-10-31 00:00:00'::TIMESTAMP + d.i * '1 day'::interval
+ h.i * '1 hour'::interval
(Or you can spell the constants like INTERVAL '1 day',
if you prefer.)
regards, tom lane
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