Lets assume my database table structure is something like

|   items    |   weight |
|============|==========|
|   item_1   |   50     |
|   item_2   |   90     |
|   item_2   |   45     |
|   item_2   |   60     |
|   item_3   |   40     | 

In the select statement, I want to show an item only for once with the highest weight also ordered by height. So the result should be :

|   items    |   weight |
|============|==========|
|   item_2   |   90     |
|   item_1   |   50     |
|   item_3   |   40     | 

I tried something like

SELECT DISTINCT items, weight FROM mytable ORDER BY weight DESC

but it didn't work because the results are actually distinct.

How can I make that selection?