No, the tables would be on the server, the same as was already being done.
Using a separate table makes it more future proof.
To access tables in server, you need to login into server.
To login into server, you need postresql user name and password sent by
client and thus stored in client computer.
It is possible to obtain this information from client computer and use it
for unauthirized access to data.
Andrus.
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TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match