ora-00942报错 请高手看一下,急在线等

CREATE OR REPLACE FUNCTION "F_COMPRARE_DM" (own      in varchar2, 
table_na in varchar2,                                                                                                                                          
bz  in varchar2,                                                                                                                                              
CONTENT IN VARCHAR2)                                                                                                                                          
return varchar2 is                                                                                                                                                                                    
Result VARCHAR2(4000);                                                                                                                                                                                
cursor col is                                                                                                                                                                                        
select column_name,data_type    from dba_tab_cols                                                                                                                                                                                where t.owner = own                                                                                                                                                                                
and table_name = table_na;                                                                                                                                                                      
v_col_all varchar2(4000) := null;                                                                                                                                                                    
v_con    varchar2(4000);                                                                                                                                                                            
v_con_all varchar2(4000) := null;                                                                                                                                                                    
v_col  varchar2(4000);                                                                                                                                                                                
v_data_type varchar2(30);    //=== 
老是提示表或视图不存在,可是这个dba_tab_cols 有呀,而且我已经给了权限grant select any dictionary to youruser; 我又用SYSTEM用户也编译不过去