GuyC is suggesting you read the SQL Reference manual for your release of DB2.
DROP TABLE syntax is described in the documentation. If you find something in the manual that is not clear, post what you found and hyour doubt. Someone will be able to clarify.
Suggest also that you speak with your dba or project manager and see if it is permissable to drop tables in your code. Many organizations do not permit developers to drop tables.
Hope this helps,