On Wednesday, February 17, 2021, Joao Miguel Ferreira <
joao(dot)miguel(dot)c(dot)ferreira(at)gmail(dot)com> wrote:
> We are using Pg 11.
>
> Example:
> a = [ x, y ]
> b = [ z , w ]
> result would be [ x, y, z, w ]
>
> What would you consider to be a suitable approach ?
>
That’s called concatenation.
https://www.postgresql.org/docs/11/functions-json.html
David J.