Writing a query to display the following result?

There are 3 tables:

Table A:

code    aname
------- ---------
1       A
2       B
3       C

Table B:

code        bname
----------- ----------
1           aaa
1           bbb
2           ccc
2           ddd

Table C:

code        cname
----------- ----------
1           xxx
1           yyy
1           zzz
2           www

We need to write a query that would display the following result:

code        aname      bname            cname
----------- ---------- ----------      ----------
1           A          aaa              xxx
1           A          bbb              yyy
1           A          NULL             zzz
2           B          ccc              www
2           B          ddd              NULL
3           C          NULL             NULL