Return the column names for which the row values are not null.

Question

Hi i m a new guy to db admin, and i need a sql script which should return column names of the particular table. and the returned column should have value (fyi - if the column has null value column name should not come in the sql o/p).
Exmple:
table name - A
s.no name mark status fee
1 aa 45 p null
2 bb 30 null paid
3 cc 35 p paid
fyi -1) if i give the table name(A) and s.no (2) the o/p should be -- name,mark.
2) if i give the tablename(A) and s.no (1) the o/p should be --- name,mark,status.
Thanks
Krishna.
Edited by: user13294228 on Jun 14, 2010 10:54 PM

Answer 1

BTW,
The previous solution is for all values of the column, if you want a specific row, you can add it in where clause.
I mean in your example, it you look like:
SET serveroutput on;
DECLARE
   l_cnt          NUMBER;
   l_str          VARCHAR2 (255) := '';
   l_table_name   VARCHAR2 (255) := 'YOUR_TABLE_NAME';
   l_col_cond     VARCHAR2 (255) := 'S_NO';
   l_val          NUMBER         := 1;
   CURSOR c_col
   IS
      SELECT column_name
        FROM user_tab_columns
       WHERE table_name = l_table_name;
BEGIN
   FOR i IN c_col
   LOOP
      EXECUTE IMMEDIATE    'SELECT COUNT ('
                        || i.column_name
                        || ') FROM '
                        || l_table_name
                        || ' WHERE '
                        || l_col_cond
                        || ' = '
                        || l_val
                   INTO l_cnt;
      l_str := l_str || CASE
                  WHEN l_cnt = 0
                     THEN ''
                  ELSE i.column_name
               END || ',';
   END LOOP;
   l_str := SUBSTR (l_str, 1, LENGTH (l_str) - 1);
   DBMS_OUTPUT.put_line (l_str);
END;Saad,
Edited by: S.Nayef on Jun 15, 2010 11:54 AM