[docs] Placeholder for our howto page

[anjakefala]

Collect stuff that would be helpful to add to a howto page

[anjakefala]

44 ### Compute rank⋅
45
46 See #2280 for a discussion on how to use window functions to compute a rank column, where the rank restarts from 1 each time the value changes. E.g:
47
48 value rank
49 ----- ----
50 A 1
51 A 2
52 B 1
53 C 1
54 C 2
55 C 3