🚀 go-pugleaf

I have a SQL challenge for the SQL Gurus out there.
The challenge is listed below.

-- Create Sample Table
create table SAMPLE
(
  CATEGORY  char(8),
  ITEM      char(15)
);

-- Insert Sample Data
insert into SAMPLE values
( 'Wood', 'Oak'    ),
( 'Wood', 'Pine'   ),
( 'Wood', 'Maple'  ),
( 'Wood', 'Cherry' ),
( 'Tool', 'Power Miter' ),
( 'Tool', 'Band Saw'    ),
( 'Tool', 'Scroll Saw'  ),
( 'Tool', 'Table Saw'   ),
( 'Lamp', ' 40W'  ),
( 'Lamp', ' 60W'  ),
( 'Lamp', '100W'  );
commit;

-- Simple Query
select CATEGORY, ITEM 
from SAMPLE 
order by CATEGORY, ITEM;

CATEGORY ITEM           
-------- ---------------
Lamp      40W           
Lamp      60W           
Lamp     100W           
Tool     Band Saw       
Tool     Power Miter    
Tool     Scroll Saw     
Tool     Table Saw      
Wood     Cherry         
Wood     Maple          
Wood     Oak            
Wood     Pine  

The Challenge:
  Can someone create an SQL statement that produces the 
  same output minus the duplicate categories. I really 
  need a DB2 example, however I may be able to convert
  an Oracle example.  A select with subquery is acceptable
  (ie. select X from ( select Y from t ...) s2, t s1 ...).

Desired output:
CATEGORY ITEM           
-------- ---------------
Lamp      40W           
          60W           
         100W           
Tool     Band Saw       
         Power Miter    
         Scroll Saw     
         Table Saw      
Wood     Cherry         
         Maple          
         Oak            
         Pine  

Please Reply-All to this message so that I can retrieve
your solution as soon as it is posted.

Thanks in advance,

Pat