Google BigQuery中的嵌套字段

Question

我正在嘗試取消嵌套一些嵌套字段並在Google BigQuery中進行子查詢。

這很好。

SELECT id, 
custom_field_options
FROM `project.database.ticket_fields`

“ custom_field_options”是一個嵌套字段，這給我帶來了一些問題。 我有“ custom_field_options.id”和“ custom_field_options.name”以及另外兩個嵌套字段。

這也很好。

SELECT ticket_fields.id,
ticket_fields.raw_title,
ticket_custom_fields.name AS ticket_custom_fields_name,
ticket_custom_fields.raw_name AS ticket_custom_fields_raw_name,
ticket_custom_fields.value AS ticket_custom_fields_value,
ticket_fields.created_at
FROM `project.database.ticket_fields` AS ticket_fields
LEFT JOIN UNNEST(custom_field_options) AS ticket_custom_fields
GROUP BY 1,2,3,4,5,6

分別運行時，這兩個查詢都可以正常運行。 現在，我嘗試將第一個查詢作為第二個查詢的子查詢來運行，以從該查詢中拉回所有ID，然后在此基礎上運行下面的查詢。

SELECT ticket_fields.id,
ticket_fields.raw_title,
ticket_custom_fields.name AS ticket_custom_fields_name,
ticket_custom_fields.raw_name AS ticket_custom_fields_raw_name,
ticket_custom_fields.value AS ticket_custom_fields_value,
ticket_fields.created_at
FROM `project.database.ticket_fields` AS ticket_fields
LEFT JOIN UNNEST(custom_field_options) AS ticket_custom_fields
  WHERE id IN (SELECT id, 
  custom_field_options
  FROM `project.database.ticket_fields`)
GROUP BY 1,2,3,4,5,6

Answer 1

您可以限定id列的名稱以使引用明確：

SELECT ticket_fields.id,
ticket_fields.raw_title,
ticket_custom_fields.name AS ticket_custom_fields_name,
ticket_custom_fields.raw_name AS ticket_custom_fields_raw_name,
ticket_custom_fields.value AS ticket_custom_fields_value,
ticket_fields.created_at
FROM `project.database.ticket_fields` AS ticket_fields
LEFT JOIN UNNEST(custom_field_options) AS ticket_custom_fields
  WHERE ticket_fields.id IN (SELECT id, 
  custom_field_options
  FROM `project.database.ticket_fields`)
GROUP BY 1,2,3,4,5,6

（我假設ticket_fields.id是您要搜索的id ）