Re: Declare variable from other variable

Raul Kaubi schrieb am 05.02.2020 um 12:21:
> How can I declare another variable from another variable.
> Basically from oracle, I can just: 
>
> var1 := 'asda'||var2;
>
> In postgres, I have the following example, I would like to use variable j to add number of months there.
>
> " interval 'j month')::date; "
>
>
> DO $$
> DECLARE
> v_var integer := 1;
> v_from_date date;
> BEGIN
> for j in 0..v_var LOOP
> v_from_date := (date_trunc('month',current_date) + interval 'j month')::date;
> RAISE NOTICE '%', v_from_date;
> END LOOP;
> END;
> $$ LANGUAGE plpgsql;

The easiest way is to use make_interval()

v_from_date := (date_trunc('month',current_date) + make_interval(months => j))::date;

But it sounds as if generate_series() is what you are really looking for.