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List: postgresql-general
Subject: Re: How to add a variable to a timestamp.
From: Tom Lane <tgl () sss ! pgh ! pa ! us>
Date: 2022-10-29 22:13:54
Message-ID: 85459.1667081634 () sss ! pgh ! pa ! us
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Adrian Klaver <adrian.klaver@aklaver.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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