Can you be a bit more specific about your issue and the requested outcome?
To eliminate duplicate records, you can use a distinct load:
LOAD DISTINCT
FieldA,
FieldB,
...
FROM ...;
To only load the first record in load order for a specific non-key field value:
LOAD
FieldA,
FieldB,
...
FROM ...
WHERE NOT EXISTS(FieldA);
edit: or maybe something completely different depending on your requirements
