Re: Passing a dynamic interval to generate_series()

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.