percent_rank

Documentação da função de janela percent_rank

retorna a classificação relativa (ou seja, o percentil) das linhas em uma partição da janela.

Sintaxe

Alias: percentRank (diferencia maiúsculas de minúsculas)

percent_rank ()
  OVER ([[PARTITION BY grouping_column] [ORDER BY sorting_column]
        [RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING]] | [window_name])
FROM table_name
WINDOW window_name as ([PARTITION BY grouping_column] [ORDER BY sorting_column] RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING)

A definição padrão e obrigatória do frame da janela é RANGE BETWEEN UNBOUNDED PRECEDING AND UNBOUNDED FOLLOWING.

Para mais detalhes sobre a sintaxe das funções de janela, consulte: Funções de janela - Sintaxe.

Exemplo

Query

CREATE TABLE salaries
(
    `team` String,
    `player` String,
    `salary` UInt32,
    `position` String
)
Engine = Memory;

INSERT INTO salaries FORMAT Values
    ('Port Elizabeth Barbarians', 'Gary Chen', 195000, 'F'),
    ('New Coreystad Archdukes', 'Charles Juarez', 190000, 'F'),
    ('Port Elizabeth Barbarians', 'Michael Stanley', 150000, 'D'),
    ('New Coreystad Archdukes', 'Scott Harrison', 150000, 'D'),
    ('Port Elizabeth Barbarians', 'Robert George', 195000, 'M'),
    ('South Hampton Seagulls', 'Douglas Benson', 150000, 'M'),
    ('South Hampton Seagulls', 'James Henderson', 140000, 'M');

Query

SELECT player, salary,
       percent_rank() OVER (ORDER BY salary DESC) AS percent_rank
FROM salaries;

Response

   ┌─player──────────┬─salary─┬───────percent_rank─┐
1. │ Gary Chen       │ 195000 │                  0 │
2. │ Robert George   │ 195000 │                  0 │
3. │ Charles Juarez  │ 190000 │ 0.3333333333333333 │
4. │ Michael Stanley │ 150000 │                0.5 │
5. │ Scott Harrison  │ 150000 │                0.5 │
6. │ Douglas Benson  │ 150000 │                0.5 │
7. │ James Henderson │ 140000 │                  1 │
   └─────────────────┴────────┴────────────────────┘