Google Big Query'yi kullanarak GROUP_CONCAT üzerinde farklı değerler nasıl alınır

Question

BigQuery'de GROUP_CONCAT kullanırken farklı değerler almaya çalışıyorum.

Ben daha basit, statik örneği kullanarak durumu yeniden oluştururuz:

DÜZENLEME: group_concat ile 2 sütun farklı olmalıdır:

daha iyi benim gerçek durumu temsil etmek örnek modifiye ettim

SELECT 
    category, 
    GROUP_CONCAT(id) as ids, 
    GROUP_CONCAT(product) as products 
FROM 
(SELECT "a" as category, "1" as id, "car" as product), 
(SELECT "a" as category, "2" as id, "car" as product), 
(SELECT "a" as category, "3" as id, "car" as product), 
(SELECT "b" as category, "4" as id, "car" as product), 
(SELECT "b" as category, "5" as id, "car" as product), 
(SELECT "b" as category, "2" as id, "bike" as product), 
(SELECT "a" as category, "1" as id, "truck" as product), 
GROUP BY 
    category 

Bu örnek verir:

Row category ids products 
1 a 1,2,3,1 car,car,car,truck 
2 b 4,5,6 car,car,bike 

ben ret etmek, bulunan yinelenen değerleri şerit istiyorum urn gibi: MySQL

Row category ids products 
1 a 1,2,3 car,truck 
2 b 4,5,6 car,bike 

, GROUP_CONCAT değer bir alternatif vardır, ama BigQuery'de yoktur.

Herhangi bir fikrin var mı? İstediğiniz sonucu elde edecek group_concat uygulamadan önce

Answer 1

İşte

olan çözüm.

SELECT 
    GROUP_CONCAT(UNIQUE(ids)) WITHIN RECORD, 
    GROUP_CONCAT(UNIQUE(products)) WITHIN RECORD 
FROM (
SELECT 
    category, 
    NEST(id) as ids, 
    NEST(product) as products 
FROM 
(SELECT "a" as category, "1" as id, "car" as product), 
(SELECT "a" as category, "2" as id, "car" as product), 
(SELECT "a" as category, "3" as id, "car" as product), 
(SELECT "b" as category, "4" as id, "car" as product), 
(SELECT "b" as category, "5" as id, "car" as product), 
(SELECT "b" as category, "2" as id, "bike" as product), 
(SELECT "a" as category, "1" as id, "truck" as product), 
GROUP BY 
    category 
) 

Answer 2

Çıkarma çiftleri: çiftleri kaldırmak UNIQUE kapsamı toplama işlevini kullanır

SELECT 
     category, 
     GROUP_CONCAT(id) as ids 
    FROM ( 
    SELECT category, id 
    FROM 
    (SELECT "a" as category, "1" as id), 
    (SELECT "a" as category, "2" as id), 
    (SELECT "a" as category, "3" as id), 
    (SELECT "b" as category, "4" as id), 
    (SELECT "b" as category, "5" as id), 
    (SELECT "b" as category, "6" as id), 
    (SELECT "a" as category, "1" as id), 
    GROUP BY 
     category, id 
    ) 
    GROUP BY 
     category