!! Getting error while using function in where clause

Question

Hi,
I have created a function as below
create function find_cnt(n varchar2)
return number is
cnt number;
begin
execute immediate 'select count(1) from '||n into cnt;
return nvl(cnt,0);
end;
and when running the below select
select find_cnt(object_name),object_name from user_objects where object_type='TABLE' and find_cnt(object_name)=0
I getting
ERROR:
ORA-04044: procedure, function, package, or type is not allowed here
ORA-06512: at "SCOTT.FIND_CNT", line 5
can anyone help????????
thanks
Harish

Answer 1

In 11g you could simply do
SQL> select table_name, trim(column_value) cnt
  from user_tables, xmltable(('count(ora:view("'||table_name||'"))'))
TABLE_NAME                     CNT      
DEPT                           4        
BONUS                          0        
SALGRADE                       5        
DEMO_USERS                     2        
DEMO_CUSTOMERS                 7        
DEMO_ORDERS                    10       
DEMO_PRODUCT_INFO              10       
DEMO_ORDER_ITEMS               16       
DEMO_STATES                    51       
DEMO_PAGE_HIERARCHY            18       
TABLE1                         6        
TABLE2                         6        
CREATE$JAVA$LOB$TABLE          0        
CLICKS                         1        
T                              0        
EMP                            14       
PLAN_TABLE                     2        
17 rows selected.