Database: Select last non-null entries

Question

Here\'s a question I\'ve been racking my brain over. Let\'s say I have a table that has a series of timestamps and a part number as the primary key. The table stores incremental

Answer 1

list of relevant timestamps:

select max timestamp from part_changes where x_POS is not null group by part

You can make this a view: lets call this view1

SELECT part_changes.part, part_changes.x-pos 
FROM part_changes left join view1 on part_changes.part = view1.part
WHERE x-pos IS NOT NULL 
 AND part_changes.timestamp = view1.timestamp 
GROUP BY part_changes.part

See where I am going? That should give you the full list for x-pos.