将子查询值从游标提取到PL/SQL中的参数

我有以下查询来选择子查询的计数:

SELECT COUNT(*) FROM (select crs_cust.CUSTOMER_ID, 
subset.NEW_REFERENCE_ID FROM CRS_CUSTOMERS crs_cust INNER JOIN DAY0_SUBSET subset ON crs_cust.CUSTOMER_ID=subset.CURRENT_CUSTOMER_ID);

上面的查询是从PL/SQL中的游标执行的,如何从子查询中获取列( CUSTOMER_ID 和 NEW_REFERENCE_ID )进入各自的参数?

光标应具有多条记录。类似如下:

p_Count := SELECT COUNT(*) FROM DAY0_SUBSET;
OPEN c1; 
LOOP
FETCH c1 into p_Current_CustomerId,p_New_Cust_Ref_ID; -->query from cursor's subquery
EXIT WHEN c1%NOTFOUND;
EXIT WHEN (c1%ROWCOUNT <> p_Count);

FOR i IN c1 LOOP
<do manipulation of subquery values>
END LOOP;
END IF;
CLOSE c1;