I am creating a table that has 2 values in it which are keys pointing to 2 other tables. I need for the UNIQUE combination of these 2 keys to exist in a fourth table. It has been recommended to use a foreign key constraint with the MATCH FULL parameter. Here is my question, does this deal with NULLS in the 4th table? I am concerned that this constraint might fail to reject an entry if one, or both of the 2 key values being inserted in the table are NULLS,. -- "They that would give up essential liberty for temporary safety deserve neither liberty nor safety." -- Benjamin Franklin
