MERGE INTO TABLE_A T USING TABLE_B T1 ON (T.STU_NO = T1.STU_NO) WHEN MATCHED THEN UPDATE SET T.NAME = T1.NAME WHEN NOT MATCHED THEN INSERT (STU_NO, NAME) VALUES (T1.STU_NO, T1.NAME);
Compare all the data in the two tables TABLE_A and TABLE_B, take TABLE_A as the main table, and use the STU_NO field of the two tables as the condition. When the two match, modify the NAME field in TABLE_A. If it does not match, insert the unmatched data in TABLE_B into TABLE_A table.
Note that the conditions after ON cannot be used as conditions and modifications in UPDATE and INSERT.