Oracle MERGE INTO

DECLARE
  STR  VARCHAR2(50);
  P_NO NUMBER(10);
BEGIN
  MERGE INTO TEST2 T2
  USING (SELECT T3.NAME, T3.DEPT, T3.BIRTHDAY
           FROM TEST3 T3
          WHERE T3.BIRTHDAY = DATE '2014-05-01') V
  ON (V.NAME = T2.C2)
  WHEN MATCHED THEN
    UPDATE SET T2.C3 = V.BIRTHDAY, T2.C1 = 86868
    
  
  WHEN NOT MATCHED THEN
    INSERT (T2.C1, T2.C2, T2.C3) VALUES (11111, V.NAME, V.BIRTHDAY);

  --MERGE INTO TEST2 为目票表将要操作的表，USING 后的SQL为数据源， ON 为条件 V.NAME 是不是等于 T2.C2  
  -- WHEN MATCHED THEN 为如果 V.NAME = T2.C2 就执行 WHEN MATCHED THEN 后的内容，如果 V.NAME 不等于 T2.C2  就执行  WHEN NOT MATCHED THEN 后的内容  
  -- WHEN MATCHED THEN 和  WHEN NOT MATCHED THEN 也可以只有一个。  

  --SELECT LEVEL INTO P_NO FROM TEST2 CONNECT BY LEVEL < 2;  
END;