begin 

declare
	procedure exec(p_stmt in varchar2)
	is
	begin
		execute immediate p_stmt;
	exception
		when others
		then
			null;
	end;
begin
	exec('drop table wmp_report_drivers cascade constraints');
	exec('drop table wmp_report_layouts cascade constraints');
	exec('drop table wmp_report_queries cascade constraints');
end;

end;