mysql,postgresql,client,server

[n dhert]

MySQL and Postgresql appear in the freebsd with many different versions.
Normally ports have only one version (the latest) and you upgrade with
portupgrade.

Sometimes a mysql-client or postgresql-client is installed as a dependency
of another port,
(e.g. a Davical install today installed postgresql-client-8.2.15_1 as a
dependency whereas
postgresql-server already has a 8.3 and 8.4 version in the ports now)
Is it save to install the newest server version?
or should one install the same version as the client one already has ?

Both for mysql and postgresq server, the corresponding client is a
dependendy.
I e.g. you already have mysql-client-5.0.90 but no mysql server yet, and you
install
mysql-server-5.5.2., will it install mysql-client-5.5.2 alongside the
existing mysql-client-5.0.90
or upgrade it ?