When doing a MERGE in Oracle SQL, how can I update rows that aren't matched in the SOURCE?

Question

I have a main database and a report database, and I need to sync a table from main into report.

However, when an item

Answer 1

The following answer is to merge data into same table

MERGE INTO YOUR_TABLE d
USING (SELECT 1 FROM DUAL) m
    ON ( d.USER_ID = '123' AND d.USER_NAME= 'itszaif') 
WHEN NOT MATCHED THEN
        INSERT ( d.USERS_ID, d.USER_NAME)
        VALUES ('123','itszaif');

This command checks if USER_ID and USER_NAME are matched, if not matched then it will insert.