create type of table

I have a problem where I need to restrict queries by more than a million ids
that are the result of another program. Typically I would in the application
layer write those ids into an IN( ) clause, but that will not work for more
than 10,000 ids. So I need to load these ids into the db into some structure
that I can call/join in the other queries. I have a I amd considering a
temporary solution where a table is loaded with the nessesary ids for
restricting the queries. I would really like something more efficent. In
oracle I know I can create a variable of type table and fill it with these
ids and then write my queries to use this table. How can I do this in
postgresql, I did not see any support for a type table.

Anyone know of any good tutorials or how-tos for doing this type of stuff in
postgresql?

Thanks - Jeff