如何按SQL中不同级别的同一列分组？

Question

Sorry, but I'm not sure how to describe this clearly in words.

Basically I have data like

name    tier    value1  value2  value3  month
Andy    1       1       2       3       1
Bob     3       2       3       1       1
Candy   2       3       1       1       1
Daniel  1       1       1       3       1
Edward  3       1       3       1       1
Frank   3       2       2       2       1
Andy    2       1       2       2       2
Bob     2       2       1       1       2
Candy   1       2       3       2       2
Daniel  1       3       1       3       2
Edward  3       1       1       1       2
Frank   3       2       3       2       2

What I want is like

month   tier    sum(value1) sum(value2) sum(value3)
1       1       2           3           6
1       2       3           1           1
1       3       5           8           4
1       1or2    5           4           7
1       1or2or3 10          12          11
2       1       5           4           5
2       2       3           3           3
2       3       3           4           3
2       1or2    8           7           8
2       1or2or3 11          11          11

I think I can run the same aggregation logic with 3 different group by and union the results, but is there a better way?

Answer 1

I think it would be better if you create a dimension table which keep all possible tier cases with tier values:

Then that query could help:

select t.month, 
       tr.tier_case as tier, 
       sum(t.sum_value1) as sum_value1,
       sum(t.sum_value2) as sum_value2,
       sum(t.sum_value3) as sum_value3
  from tiers tr
  join (
        select month,  
               tier, 
               sum(value1) as sum_value1,
               sum(value2) as sum_value2,
               sum(value3) as sum_value3
          from table t
         group by 1,2
       )t
    on tr.tier = t.tier
 group by 1,2