CF9 - Best way to compare LDAP data in .ldf file against database?

Hello, everyone.
I am tasked with creating a script that will take LDAP information from a .ldf file and compare each entry to a database, adding names that meet certain criteria.
What is the best way to do this? I've never worked with LDFs, before.
Thank you,
^_^

JDBC concerns connecting to the database. I have only worked on Oracle and I am not sure if this function is one of theirs or SQL standard. Basically it works like this:
The following statement combines results with the MINUS operator, which returns only rows returned by the first query but not by the second:
SELECT product_id FROM inventories
MINUS
SELECT product_id FROM order_items;
taken from : http://www.cs.ncl.ac.uk/teaching/facilities/swdoc/oracle9i/server.920/a96540/queries5a.htm

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