How do I copy an element of composite type array into csv file?

On Wednesday, May 23, 2018, a <372660931(at)qq(dot)com> wrote:

> Thank you very much.
>
> BTW, may I ask if I would like to do the opposite that copy csv file
> content into the first element, how should I do it??
>
> COPY B(Ay[1])
> from 'E:/products_199.csv' DELIMITER ',' CSV HEADER;
>

you cannot put "[1]" there. The csv file value has to be an array input
literal with only one element. i.e., something like: {(1,2)}

There is no first element as such when you are creating a new record.
There will be however many elelements to supply to the array input.

David J.