Update same row multiple times in postgresql

multi_update_same_row.sql

drop table if exists s_multi_update_same_row;

create table s_multi_update_same_row(
	id int,
	count int
);

insert into s_multi_update_same_row select id, 0 from generate_series(1, 1000) as id;

update s_multi_update_same_row A set count = count + 1 from generate_series(1, 10000) as B(id) where A.id = B.id % 1000 + 1;

select id, count from s_multi_update_same_row limit 10;