How to select columns with null values

Question

HI
In my table ‘A’ I have 10 columns and 30,000 records. I need all those columns whose value is null for all the records.
For example in the below table column 'suffix' is null for all the records. So I want column suffix to be selected.
Name Suffix Street
James 1100 Washington street
Richard 273 GEORGIA ST
Arnold 3018 OAKHILL AVE
MICHAEL 834 E 161ST ST
Joseph 410 PINE AVE
Thanks in advance

Answer 1

True...
But, i think here null needs to handle otherwise it will again throw some error like this ->
satyaki>
satyaki>select * from v$version;
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0      Production
TNS for 32-bit Windows: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
Elapsed: 00:00:00.20
satyaki>
satyaki>
satyaki>
satyaki>SELECT owner, table_name, column_name
  2    FROM all_tab_cols
  3   WHERE data_type NOT IN ('BLOB', 'LONG', 'CLOB')
  4         AND dbms_xmlgen.getxmltype('select count('
  5                                    || CASE
  6                                          WHEN data_type NOT IN
  7                                                     ('BLOB', 'LONG', 'CLOB')
  8                                          THEN
  9                                             column_name
10                                          ELSE
11                                             '1'
12                                       END
13                                    || ') c from '
14                                    || owner
15                                    || '.'
16                                    || table_name).EXTRACT (
17               '//text()'
18            ).getnumberval () = 0
19         AND table_name IN
20                  (SELECT table_name
21                     FROM all_tab_privs
22                    WHERE privilege = 'SELECT' AND USER IN (grantor, grantee));
ERROR:
ORA-19202: Error occurred in XML processing
ORA-24347: Warning of a NULL column in an aggregate function
ORA-06512: at "SYS.DBMS_XMLGEN", line 288
ORA-06512: at line 1
no rows selected
Elapsed: 00:00:04.03
satyaki>Or,
satyaki>
satyaki>
satyaki>SELECT table_name, column_name
  2    FROM user_tab_cols
  3   WHERE data_type NOT IN ('BLOB', 'LONG', 'CLOB')
  4   AND   dbms_xmlgen.getxmltype('select count('
  5                               || CASE
  6                                    WHEN data_type NOT IN ('BLOB', 'LONG', 'CLOB') THEN
  7                                          column_name
  8                                    ELSE
  9                                      '1'
10                                  END
11                               || ') c from '||table_name).EXTRACT('//text()').getnumberval() = 0;
AND   dbms_xmlgen.getxmltype('select count('
ERROR at line 4:
ORA-19202: Error occurred in XML processing
ORA-24347: Warning of a NULL column in an aggregate function
ORA-06512: at "SYS.DBMS_XMLGEN", line 288
ORA-06512: at line 1
Elapsed: 00:00:02.66
satyaki>
satyaki>Do you have any idea to resolve this issue in this context?
Regards.
Satyaki De.