using NOLOCK cause Cartesian joins

Hi,

When we use WITH (NOLOCK) at the end of table list in a SELECT query, a
Cartesian join is returned (i.e. approximately 6,500 records instead of
57, which is distressing.

We are building a database-agnostic system; while I believe PostgreSQL
is using a multiversion locking model and does not need WITH (NOLOCK),
our application also must run against MS SQL Server and that uses a
concurrency control locking model. We are using PostgreSQL 7.3.2 on
RedHat 7.2.

Any suggestions?

Thanks in advance,

Roger

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