Google bigquery Google BigQuery中的查询JSON字符串

我在BigQuery中的一列中有以下JSON值，我正在努力将数据拉入列中

价值观让我们：

[{"availableSlots":0,"date":"03/16/2021","day":"Tue","slotType":"AM","totalSlots":5},{"availableSlots":2,"date":"03/16/2021","day":"Tue","slotType":"PM","totalSlots":5},{"availableSlots":5,"date":"03/17/2021","day":"Wed","slotType":"AM","totalSlots":5},{"availableSlots":5,"date":"03/17/2021","day":"Wed","slotType":"PM","totalSlots":5},{"availableSlots":5,"date":"03/18/2021","day":"Thu","slotType":"AM","totalSlots":5}]

我试图得到可用地块的第一和第二个值

我尝试了JSON_EXTRACT_SCALAR和JSON_EXTRACT

感谢您的帮助。

请参见下面的示例

with `project.dataset.table` as (
  select '[{"availableSlots":0,"date":"03/16/2021","day":"Tue","slotType":"AM","totalSlots":5},{"availableSlots":2,"date":"03/16/2021","day":"Tue","slotType":"PM","totalSlots":5},{"availableSlots":5,"date":"03/17/2021","day":"Wed","slotType":"AM","totalSlots":5},{"availableSlots":5,"date":"03/17/2021","day":"Wed","slotType":"PM","totalSlots":5},{"availableSlots":5,"date":"03/18/2021","day":"Thu","slotType":"AM","totalSlots":5}]' col 
)
select 
  json_extract_scalar(json, '$.availableSlots') as availableSlots,
  json_extract_scalar(json, '$.date') as date,
  json_extract_scalar(json, '$.day') as day,
  json_extract_scalar(json, '$.slotType') as slotType,
  json_extract_scalar(json, '$.totalSlots') as totalSlots
from `project.dataset.table`, 
unnest(json_extract_array(col, '$')) json

有输出

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你试过了吗？如果它对你有用（我认为应该）——考虑投票并接受答案。