[SQL] sql

[cristi]

I have 3 tables.   table_a marca 15145 1455 1333   table_b data 11-01-2002 11-02-2002   table_c marca    data 15145    11-01-2002 15145    11-02-2002 1455      11-01-2002 1333      11-01-2002 1333      11-02-2002   After interogation of the tables I need this kind of result:   marca    data 1455     11-02-2002   (I want to receive the records which are a combitation of fields of table_a and table_b and that are not in the table_c)   How can I do that?   Thanks!