查詢會話中的自定義維度以及命中級別

Question

具有索引6的customDimensions對應於會話和命中級別上的UUID。

在會話水平，我可以使用下列標準的SQL查詢來檢索的UUID：

CREATE TEMP FUNCTION customDimensionByIndex(indx INT64, arr ARRAY<STRUCT<index INT64, value STRING>>) AS (
    (SELECT x.value FROM UNNEST(arr) x WHERE indx=x.index) 
); 

SELECT 
customDimensionByIndex(6, customDimensions) AS session_uuid -- Customer UUID 
FROM `94860076.ga_sessions_20170822` 
limit 10 

同樣，在命中水平，我可以使用：

CREATE TEMP FUNCTION customDimensionByIndex(indx INT64, arr ARRAY<STRUCT<index INT64, value STRING>>) AS (
    (SELECT x.value FROM UNNEST(arr) x WHERE indx=x.index) 
); 

SELECT 
customDimensionByIndex(6, hits.customDimensions) AS hit_uuid -- Customer UUID 
FROM `94860076.ga_sessions_20170822`, unnest(hits) as hits 
limit 10 

不過，我不在同一個查詢中使用兩者。例如，我想要一個結果集，其中每行對應於會話，列爲session_uuid和array_of_hit_uuids。這怎麼能實現？

Answer 1

下面是BigQuery的標準SQL

#standardSQL 
CREATE TEMP FUNCTION customDimensionByIndex(indx INT64, arr ARRAY<STRUCT<index INT64, value STRING>>) AS (
    (SELECT x.value FROM UNNEST(arr) x WHERE indx=x.index) 
); 
SELECT * 
FROM (
    SELECT 
    customDimensionByIndex(6, customDimensions) AS session_uuid, 
    ARRAY(
     SELECT val FROM (
     SELECT customDimensionByIndex(6, hits.customDimensions) AS val 
     FROM UNNEST(hits) AS hits 
    ) 
     WHERE NOT val IS NULL 
    ) AS hit_uuid 
    FROM `94860076.ga_sessions_20170822` 
) 
WHERE session_uuid IS NOT NULL 
LIMIT 10 

您可以通過公共數據集進行測試

#standardSQL 
CREATE TEMP FUNCTION customDimensionByIndex(indx INT64, arr ARRAY<STRUCT<index INT64, value STRING>>) AS (
    (SELECT x.value FROM UNNEST(arr) x WHERE indx=x.index) 
); 
SELECT * 
FROM (
    SELECT 
    customDimensionByIndex(2, customDimensions) AS session_uuid, 
    ARRAY(
     SELECT val FROM (
     SELECT customDimensionByIndex(1, hits.customDimensions) AS val 
     FROM UNNEST(hits) AS hits 
    ) 
     WHERE NOT val IS NULL 
    ) AS hit_uuid 
    FROM `google.com:analytics-bigquery.LondonCycleHelmet.ga_sessions_20130910` 
) 
WHERE session_uuid IS NOT NULL 
LIMIT 10