selecting more that 2 tables based on 1 subquery find an error (revision)

Dear my friends...

I am using SuSE 9.1 and postgres.

I want to "select" query 2 tables. one is "customer"
and one is "customer.description" but the customer
records that I want to "select" are only what in
subquery result.

Here what I've done:

postgres(at)patrix:~> psql kv
Welcome to psql 7.4.2, the PostgreSQL interactive
terminal.

Type: \copyright for distribution terms
\h for help with SQL commands
\? for help on internal slash commands
\g or terminate with semicolon to execute query
\q to quit

kv=# select c.custid, cd.description, c.company,
c.title, c.salutation, c.firstname, c.lastname,
c.address, c.postcode, c.city, c.areacode, c.phone,
c.mobilephone, c.fax, c.email from customer as c,
customerdescription as cd where c.custid in (select
custid from sven1);

Terminated
postgres(at)patrix:~>

Anybody could give me any solution?

Thank you very much in advance.

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