Retrieve column names of a table!!

Question

Hi all,
I want to retrieve column names of a table 'test' whose values are null
For ex:
select * from test
will give the results as
column_1 column_2 column_3 column_4
111
lets consider the case that the table has only one record.
accordingly we have to get column_2 ,column_3 and column_4 as the result.
i tried dynamic 'execute immediate' statement and tried to extract in one single execute immediate statement but i was not able to accomplish because of the multiple columns.
is it possible without using a pl/sql function or procedure??

Answer 1

Check this:
SQL> INSERT INTO my_Test values('ABCD',NULL,NULL);
1 row created.
SQL> COMMIT;
Commit complete.
SQL> select * from my_Test;
COL1       C COL3
ABCD
SQL> declare
  2  CURSOR C1 IS SELECT column_name FROM all_tab_cols WHERE table_name = 'MY_TEST';
  3  v_sql VARCHAR2(10000) := NULL;
  4  my_null_col_list VARCHAR2(32767) := NULL;
  5  my_cnt NUMBER := 0;
  6  BEGIN
  7  FOR I in C1 LOOP
  8  v_sql := 'SELECT COUNT(*) FROM my_test WHERE '||I.column_name ||' IS NULL';
  9  execute immediate v_sql INTO my_cnt;
10  IF (my_cnt > 0) THEN
11  my_null_col_list := my_null_Col_list||','||I.column_name;
12  END IF;
13  END LOOP;
14  my_null_col_list := SUBSTR(my_null_col_list,2);
15  dbms_output.put_line('Columns that have null values for table my_Test are:'||my_null_col_list);
16  END;
17  /
Columns that have null values for table my_Test are:COL2,COL3
PL/SQL procedure successfully completed.
SQL> desc my_test;
Name                                      Null?    Type
COL1                                               VARCHAR2(10)
COL2                                               VARCHAR2(1)
COL3                                               VARCHAR2(10)
SQL>