SQL self join multiple times

Question

I have a single database table that stores week entries.

Id        Value     WeekId
1         1.0000    1
2         2.0000    1

There can be up

Answer 1

You will need to add in your where clause the possibility that w2.Id is null or w3.id is null

So something like

WHERE 
  (w2.Id is null and w3.id is null) or 
  (w3.id is null and w1.id < w2.id) or 
  (w1.id < w2.id and w2.id < w3.id)