\c yugabyte yugabyte
drop table demo;
create table demo (k int primary key, v int, ts timestamp default now());
insert into demo (k,v) values(42,1);
select from demo;
insert into demo (k,v) values(42,2);
select from demo;
insert into demo (k,v) values(42,3)
on conflict(k) do update set v=3;
select * from demo;