公用表表达式(Common Table Expression)与游标混合应用例子：

Oracle存储过程中cursor + with用法 

-- P_PO_TYPE_CODE: 采购单据类型，如标准采购订单、一揽子采购协议 
-- P_ITEM_CODE : 物料号
-- P_CURSOR1: 输出游标类型资料
CREATE OR REPLACE PROCEDURE CUX_TEST_CUR_RV( 
   P_PO_TYPE_CODE IN VARCHAR2,
   P_ITEM_CODE IN VARCHAR2,    
   P_CURSOR1 OUT SYS_REFCURSOR)
AS 
BEGIN 
  OPEN P_CURSOR1 FOR  WITH CTE AS (
      SELECT PV.VENDOR_NAME, PV.VENDOR_CODE, PHA.PO_NUMBER,PLA.UNIT_PRICE, PHA.CREATION_DATE
       FROM PO_HEADERS_ALL PHA, PO_LINES_ALL PLA, PO_VENDORS PV 
       WHERE PHA.PO_HEADER_ID = PLA.PO_HEADER_ID 
        AND PHA.VENDOR_ID = PV.VENDOR_ID 。。。。。 ), 
      DPT_INFO AS (
        SELECT .....
	)
     SELECT  CTE.VENDOR_NAME, CTE.VENDOR_CODE, CTE.PO_NUMBER,CTE.UNIT_PRICE
      FROM CTE , DPT_INFO DI
      WHERE CTE.PO_NUMBER = DI.PO_NUMBER .....
END; 

-- 测试 游标 
declare
  R1 sys_refcursor;
  V_VENDOR_NAME VARCHAR2(250);
  V_VENDOR_CODE VARCHAR2(150);
  V_PO_NUMBER VARCHAR2(150);
  V_UNIT_PRICE NUMBER;
begin

  CUX_TEST_CUR_RV( 'BLANKET','GL0116', R1);
  loop
    fetch R1 into V_VENDOR_NAME, V_VENDOR_CODE, V_PO_NUMBER,V_UNIT_PRICE;
    exit when R1%notfound;
    DBMS_OUTPUT.PUT_LINE('VENDOR_NAME,PO_NUMBER,UNIT_PRICE:'|| V_VENDOR_NAME|| ','||V_PO_NUMBER|| ','||TO_CHAR( V_UNIT_PRICE, 'fm9999999999999990.00'));
    
  end loop;
  close R1;
end;