我正在尝试使用CTE（通用表表达式）的简单合并语句。但它给出了一个错误

MERGE INTO  emp targ USING (
*
ERROR at line 4:
ORA-00928: missing SELECT keyword

合并语句中是否不允许CTE？我的SQL如下：

WITH cte AS (
  SELECT empno, ename 
    FROM EMP)
MERGE INTO emp targ USING (SELECT * 
                             FROM cte) src
  ON (targ.empno = src.empno)
WHEN MATCHED THEN update 
   SET targ.ename = src.ename
WHEN NOT MATCHED THEN insert
    (empno,ename)
  VALUES
    (src.empno,src.ename)
/