Generating a table with missing values in SQL

[Edwin]

I have the following table:

+------+------+------+-----------+
|ID |GROUP |CODE |ANSWER |
+------+------+------+-----------+
|1 |1 |001 |01-01-2003 |
|2 |1 |002 |Yes |
|3 |1 |003 |NA |
|4 |1 |004 |297797 |
|5 |1 |005 |0 |
|6 |2 |002 |Yes |
|7 |2 |004 |297852 |
|8 |2 |005 |1 |
+------+------+------+-----------+

This means that code 001 and 003 of group 2 are missing. Result of the
query should be:

+-------+-----------+-----------+-----------+-----------+--------+
|GROUP |ANSWER1 |ANSWER2 |ANSWER3 |ANSWER4 |ANSWER5 |
+-------+-----------+-----------+-----------+-----------+--------+
|1 |01-01-2003 |Yes |NA |297797 |0 |
|2 |NULL |Yes |NULL |297852 |1 |
+-------+-----------+-----------+-----------+-----------+--------+

The missing values should be replaced by a NULL value in my resultset.
Is this possible? I don't have any clue how my query should look like,
can anyone help me and show me a solution? Thanks.