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MERGE INTO test@ly_dblink A
using(SELECT ID, age, NAME FROM test) T
ON(T.id=A.id)
WHEN NOT MATCHED THEN
INSERT
(ID, age, NAME)
VALUES
(T.id, T.age, T.name)
WHEN MATCHED THEN
UPDATE
SET ID = T.id,
age = T.age,
NAME = T.NAME;