SQL & PL/SQL

Hello,

I want to count the number of rows that will be displayed the following query

SELECT  STAFF_ID, 
        TRUNC(CVDATE), 
        COUNT(*)
  FROM  cvProperties
  GROUP BY STAFF_ID, 
           TRUNC(CVDATE)
/ 

So far I tried is:

SQL> SELECT  STAFF_ID,
  2          TRUNC(CVDATE),
  3          COUNT(*)
  4    FROM  cvProperties
  5    GROUP BY STAFF_ID,
  6             TRUNC(CVDATE)
  7  /

  STAFF_ID TRUNC(CVD   COUNT(*)
---------- --------- ----------
         1 19-NOV-11        663
         1 27-NOV-11        307
         1 01-DEC-11         60
         1 07-DEC-11         32
         1 28-NOV-11        107
         1 17-NOV-11        368
         1 23-NOV-11          5
         1 29-NOV-11        238
         1 06-DEC-11         91
        41 09-DEC-11          1
         1 08-DEC-11         54

  STAFF_ID TRUNC(CVD   COUNT(*)
---------- --------- ----------
         1 03-DEC-11         79

12 rows selected.

SQL> select (SELECT  STAFF_ID,
  2          TRUNC(CVDATE),
  3          COUNT(*)
  4    FROM  cvProperties
  5    GROUP BY STAFF_ID,
  6             TRUNC(CVDATE)
  7  ) from dual;
select (SELECT  STAFF_ID,
        *
ERROR at line 1:
ORA-00913: too many values


SQL> select count(SELECT  STAFF_ID,
  2          TRUNC(CVDATE),
  3          COUNT(*)
  4    FROM  cvProperties
  5    GROUP BY STAFF_ID,
  6             TRUNC(CVDATE)
  7  ) from dual;
select count(SELECT  STAFF_ID,
             *
ERROR at line 1:
ORA-00936: missing expression

Thanks & best regards