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From: Shammat <[email protected]>
To: [email protected]
Subject: Re: Passing a dynamic interval to generate_series()
Date: Mon, 1 Jul 2024 09:37:24 +0200
Message-ID: <[email protected]> (raw)
In-Reply-To: <CA+zig0-suhFUeS7xcJyZ=4HDFXJ3Kn2adXo3B4zHUzDFgMscCw@mail.gmail.com>
References: <CA+zig0-suhFUeS7xcJyZ=4HDFXJ3Kn2adXo3B4zHUzDFgMscCw@mail.gmail.com>


Igal Sapir schrieb am 01.07.2024 um 00:39:
> I am trying to pass a dynamic interval to generate_series() with date range.
>
> This works as expected, and generates a series with an interval of 1 month:
>
> SELECT generate_series(
>     date_trunc('month', current_date),
>     date_trunc('month', current_date + interval '7 month'),
>     interval '1 month'
> )
>
>
> This works as expected and returns an interval of 1 month:
>
> SELECT ('1 ' || 'month')::interval;
>
>
> But this throws an error (SQL Error [42601]: ERROR: syntax error at or near "'1 '"):
>
> SELECT generate_series(
>     date_trunc('month', current_date),
>     date_trunc('month', current_date + interval '7 month'),
>     interval ('1 ' || 'month')::interval
> )

I am a fan of make_interval() when it comes to creating intervals from dynamic parameters:

SELECT generate_series(
    date_trunc('month', current_date),
    date_trunc('month', current_date + interval '7 month'),
    make_interval(months => 1)
)


The value for make_interval() can e.g. passed as a parameter from your programming language.

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