hmidi slim <hmidi(dot)slim2(at)gmail(dot)com> writes:
> I used an update query to update the modified rows, however when I search
> on the net I found that some people said that update is cpu intensive
> consumer and delete+insert is faster.
It's possible that there are RDBMSes somewhere for which that is true.
But as far as Postgres is concerned, it's nonsense.
regards, tom lane