Как правильно группировать ARRAY

Question

Мне нужно получить participant_name победителя за каждый race_name из следующей таблицы

WITH race AS (    
  SELECT 'A' AS race_name, [4, 1, 3] as participant_id, [25.3, 29.4, 24.1] as timing  UNION ALL    
  SELECT 'B', [2, 1, 4, 6], [16.3, 14.2, 17.4, 18.3] UNION ALL    
  SELECT 'C', [7, 5, 4, 2], [19.5, 21.4, 16.4, 15.6]     
),

participant AS (    
  SELECT 1 as participant_id, 12 as participant_age, "Julie" as participant_name UNION ALL    
  SELECT 2, 11, "Max" UNION ALL    
  SELECT 3, 12, "John" UNION ALL    
  SELECT 4, 11, "Matt" UNION ALL    
  SELECT 5, 13, "Diana" UNION ALL    
  SELECT 6, 12, "Peter" UNION ALL    
  SELECT 7, 11, "Ben"     
)

SELECT race_name, 
  (SELECT participant_name 
    FROM participant CROSS JOIN UNNEST(timing) AS duration 
    ORDER BY duration ASC 
    LIMIT 1
  )
FROM race 

Я получаю participant_name участника с самым низким временем, но не по каждому race_name. Как это исправить?

Answer 1

Ниже для BigQuery Standard SQL

#standardSQL
SELECT race_name, 
  (SELECT participant_name
    FROM UNNEST(participant_id) AS participant_id WITH OFFSET 
    JOIN UNNEST(timing) AS duration WITH OFFSET USING(OFFSET)
    LEFT JOIN participant USING(participant_id)
    ORDER BY duration ASC 
    LIMIT 1
  ) participant_name 
FROM race

Если применить к образцу данных из вашего вопроса - результат будет

Row race_name   participant_name     
1   A           John     
2   B           Julie    
3   C           Max