BigQuery concat 嵌套数组 json

Posted 2023-03-24

【中文标题】BigQuery concat 嵌套数组 json

【英文标题】：BigQuery concat nested array json

【发布时间】：2020-11-26 05:43:07

【问题描述】：

我的数据看起来像

    "Attributes": [
        
            "values": [
                
                    "value": "20003"
                ,
                
                    "value": "30075"
                ,
                
                    "value": "40060"
                
            ],
            "name": "price"
        
    ],
    "attr2" : "val"

我想要的输出是连接嵌套 json 数组中的所有值

price, "20003, 30075, 40060"

我尝试了一些查询，但未能获得正确的输出。

【参考方案1】：

您可以使用JSON_EXTRACT_ARRAY 和ARRAY_TO_STRING：

WITH test_json AS (
  SELECT
    '''
        "Attributes": [
            
                "values": [
                    
                        "value": "20003"
                    ,
                    
                        "value": "30075"
                    ,
                    
                        "value": "40060"
                    
                ],
                "name": "price"
            
        ],
        "attr2" : "val"
    ''' AS json_string
),
values_concatenated AS (
  SELECT ARRAY_TO_STRING(
    ARRAY(
      SELECT JSON_VALUE(json_values, '$.value')
      FROM UNNEST((SELECT JSON_EXTRACT_ARRAY(json_string, '$.Attributes[0].values') AS json_values FROM test_json)) as json_values
    ),
    ', '
  ) as values
)
SELECT
  (select json_value(json_string, '$.Attributes[0].name') from test_json),
  (select values from values_concatenated)