如何按自定义顺序对 presto sql 输出进行排序？

Question

I have a table with a column for hierarchy(nation, state, county) and prizes(gold, silver, bronze). I need to order it this way

hierarchy	prize
nation	gold
nation	silver
nation	bronze
state	gold
state	silver
state	bronze
county	gold
county	silver
county	bronze

Order By Asc or Desc does not achieve this. Is there a way to customize a Order by clause?

Answer 1

Use CASE in the ORDER BY :

SELECT hierarchy, prize
FROM table_name
ORDER BY
  CASE hierarchy
    WHEN 'nation' THEN 1
    WHEN 'state' THEN 2
    WHEN 'county' THEN 3
    ELSE 4 END,
  CASE prize
    WHEN 'gold' THEN 1
    WHEN 'silver' THEN 2
    WHEN 'bronze' THEN 3
    ELSE 4 END

Answer 2

Use case statement to map from value to order for order by clause:

-- sample data
WITH dataset (hierarchy, prize) AS (
    values ('nation', 'gold'),
        ('nation', 'silver'),
        ('nation', 'bronze'),
        ('county', 'silver'),
        ('county', 'bronze'),
        ('state', 'gold'),
        ('state', 'silver'),
        ('state', 'bronze'),
        ('county', 'gold')

) 

-- query
select *
from dataset
order by 
    case
        hierarchy
        when 'nation' then 1
        when 'state' then 2
        when 'county' then 3
        else 999
    end,
    case
        prize
        when 'gold' then 1
        when 'silver' then 2
        when 'bronze' then 3
        else 999
    end

Output:

hierarchy	prize
nation	gold
nation	silver
nation	bronze
state	gold
state	silver
state	bronze
county	gold
county	silver
county	bronze