Originally Posted by Owen Pierce

uhm... you said "DB1" and "DB2".. so.. I'm gonna assume you actually mean databases, although it seems more likely you mean tables... anyways.

INSERT INTO
db1.table
(field1,field2,field3)
SELECT
t2.field1,
t2.field2,
t2.field3
FROM
db1.table t2
LEFT OUTER JOIN db2.table t1 ON (t1.id = t2.id)
WHERE
t1.id IS NULL