1) Depending on the type of database backend you may do that in a query.
SELECT CASE WHEN ... THEN ... ELSE ... END AS "Name", ... FROM "Table"

2) Everything you may ask about mail merge:
http://openoffice.blogs.com/openoffice/mail_merge/
May 02, 2007
Suppressing Blank Address2 Fields in OpenOffice.org Labels, Envelopes, or Other 
Documents, for Mail Merges



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