我有这个json存储在BigQuery表中的3个字段标记，问题，答案
令牌：STRING，问题：STRING，答案：STRING
问题和答案是STRING，因为它们是动态字段。
令牌字段具有单个值。
问题字段有dictionary个对象，其中“字段”为list个对象，并有3个问题。
答案字段是list对象，其中包含3个问题的答案，id将用于将问题与答案进行匹配。以下是来自bigquery的JSON下载
token questions answers
18e6d8e445 {"fields": [{"id": "L39FyvUohKDV", "properties": {}, "ref": "d8834652-3acf-4541-8354-1e3dcd716667", "title": "What did you think about the changes?", "type": "short_text"}, {"id": "krs82KgxHwGb", "properties": {}, "ref": "5b6e6796-635b-4595-9404-e81617d4540b", "title": "How useful is this feature turning out to be for you?", "type": "opinion_scale"}, {"id": "lBzHtCuzHFM4", "properties": {}, "ref": "b76be913-19b9-4b8a-b2ac-3fb645a65a5c", "title": "Your email address", "type": "email"}], "id": "SdzXVn", "title": "Google Shopping 5/4/18"} [{"field": {"id": "L39FyvUohKDV", "type": "short_text"}, "text": "t", "type": "text"}, {"field": {"id": "krs82KgxHwGb", "type": "opinion_scale"}, "number": 10, "type": "number"}, {"email": "t@t.com", "field": {"id": "lBzHtCuzHFM4", "type": "email"}, "type": "email"}]
949b2c57e3 {"fields": [{"id": "krs82KgxHwGb", "properties": {}, "ref": "5b6e6796-635b-4595-9404-e81617d4540b", "title": "How useful is this feature turning out to be for you?", "type": "opinion_scale"}, {"id": "lBzHtCuzHFM4", "properties": {}, "ref": "b76be913-19b9-4b8a-b2ac-3fb645a65a5c", "title": "Your email address", "type": "email"}, {"id": "L39FyvUohKDV", "properties": {}, "ref": "d8834652-3acf-4541-8354-1e3dcd716667", "title": "What did you think about the changes?", "type": "short_text"}], "id": "SdzXVn", "title": "Google Shopping 5/4/18"} [{"field": {"id": "krs82KgxHwGb", "type": "opinion_scale"}, "number": 10, "type": "number"}, {"email": "someone@mail.com", "field": {"id": "lBzHtCuzHFM4", "type": "email"}, "type": "email"}, {"field": {"id": "L39FyvUohKDV", "type": "short_text"}, "text": "they were awesome", "type": "text"}]
146c49cdd6 {"fields": [{"id": "CxhfK22a3XWE", "properties": {}, "ref": "d8834652-3acf-4541-8354-1e3dcd716667", "title": "What did you think about the changes?", "type": "short_text"}, {"id": "oUZxPRaKjmFr", "properties": {}, "ref": "5b6e6796-635b-4595-9404-e81617d4540b", "title": "How useful is this feature turning out to be for you?", "type": "opinion_scale"}, {"id": "zUIP73oXpLD6", "properties": {}, "ref": "b76be913-19b9-4b8a-b2ac-3fb645a65a5c", "title": "Your email address", "type": "email"}], "id": "kaiAsx", "title": "a - b"} [{"field": {"id": "CxhfK22a3XWE", "type": "short_text"}, "text": "nice", "type": "text"}, {"field": {"id": "oUZxPRaKjmFr", "type": "opinion_scale"}, "number": 2, "type": "number"}, {"email": "foo@bar.com", "field": {"id": "zUIP73oXpLD6", "type": "email"}, "type": "email"}]
@ mikhail-berlyant在下面提供了这个查询，这让我非常接近我所期待的。我遇到的唯一问题是我无法得到答案。
SELECT distinct token, id, title AS question,
JSON_EXTRACT_SCALAR(CONCAT('{',a,'}'), '$.type') answer_type
--REPLACE(REGEXP_EXTRACT(b, r'"type":".+?"\s*,\s*".+?":(.+)'), '"', '') answer
FROM `v1-dev-main.typeform.responses`,
UNNEST(REGEXP_EXTRACT_ALL(JSON_EXTRACT(definition, '$.fields'), r'"title":"(.+?)"')) title WITH OFFSET pos1,
UNNEST(REGEXP_EXTRACT_ALL(JSON_EXTRACT(definition, '$.fields'), r'"id":"(.+?)"')) id WITH OFFSET pos2,
UNNEST(REGEXP_EXTRACT_ALL(answers, r'"field": {(.+?)}')) a WITH OFFSET pos3
--UNNEST(REGEXP_EXTRACT_ALL(answers, r'{(.+?),\s*"field":{.+?}')) b WITH OFFSET pos4
WHERE pos1 = pos2
--AND pos3 = pos4
AND id = JSON_EXTRACT_SCALAR(CONCAT('{',a,'}'), '$.id')
以上是上述查询的结果
token id question answer_type
146c43c81cd5780839d3cdd6 zUIP73oXpLD6 Your email address email
146c493c1cd5780839d3cdd6 oUZxPRaKjmFr How useful is this feature turning out to be for you? opinion_scale
146c493c05d5780839d3cdd6 CxhfK22a3XWE What did you think about the changes? short_text
18e6d8e33df44a1aa451b445 lBzHtCuzHFM4 Your email address email
18e6d8e33df44a1aa451b445 L39FyvUohKDV What did you think about the changes? short_text
18e6d0fa014bfa1aa451b445 krs82KgxHwGb How useful is this feature turning out to be for you? opinion_scale
a63b20df691c9a949b2c57e3 krs82KgxHwGb How useful is this feature turning out to be for you? opinion_scale
a63b20df691c9a949b2c57e3 lBzHtCuzHFM4 Your email address email
a63b258ce0339a949b2c57e3 L39FyvUohKDV What did you think about the changes? short_text
现在，我只是错过了答案。
答案 0 :(得分：3)
以下示例适用于BigQuery Standard SQL，并根据这些json字符串的格式对数据做出一些假设 - 因此大多数情况下可能需要对regexp进行一些调整。但它适用于以下虚拟数据
#standardSQL
WITH `project.dataset.table` AS (
SELECT 12345 token,
'''{"fields": [
{"id":"1","title":"Question 1?"},
{"id":"2","title":"Questions 2?"},
{"id":"3","title":"Question 3?"}
]}''' questions,
'''[
{"type":"text", "text":"answer 1", "field":{"id":"1", "type":"short_text"}},
{"type":"number", "number":42, "field":{"id":"2", "type":"opinion_scale"}},
{"type":"email", "email":"an_account@example.com", "field":{"id":"3", "type":"email"}}
]''' answers
)
SELECT token, id, title AS question,
JSON_EXTRACT_SCALAR(CONCAT('{',a,'}'), '$.type') answer_type,
REPLACE(REGEXP_EXTRACT(b, r'"type":".+?"\s*,\s*".+?":(.+)'), '"', '') answer
FROM `project.dataset.table`,
UNNEST(REGEXP_EXTRACT_ALL(JSON_EXTRACT(questions, '$.fields'), r'"title":"(.+?)"')) title WITH OFFSET pos1,
UNNEST(REGEXP_EXTRACT_ALL(JSON_EXTRACT(questions, '$.fields'), r'"id":"(.+?)"')) id WITH OFFSET pos2,
UNNEST(REGEXP_EXTRACT_ALL(answers, r'"field":{(.+?)}')) a WITH OFFSET pos3,
UNNEST(REGEXP_EXTRACT_ALL(answers, r'{(.+?),\s*"field":{.+?}')) b WITH OFFSET pos4
WHERE pos1 = pos2
AND pos3 = pos4
AND id = JSON_EXTRACT_SCALAR(CONCAT('{',a,'}'), '$.id')
结果为
Row token id question answer_type answer
1 12345 1 Question 1? short_text answer 1
2 12345 2 Questions 2? opinion_scale 42
3 12345 3 Question 3? email an_account@example.com
根据以下评论进行更新
#standardSQL
WITH `project.dataset.table` AS (
SELECT "12345" token, '{"fields": [{"id":"1","title":"Question 1?"},{"id":"2","title":"Questions 2?"},{"id":"3","title":"Question 3?"}]}' questions,'[ {"type":"text", "text":"answer 1", "field":{"id":"1", "type":"short_text"}},{"type":"number", "number":42, "field":{"id":"2", "type":"opinion_scale"}},{"type":"email", "email":"an_account@example.com", "field":{"id":"3", "type":"email"}}]' answers UNION ALL
SELECT "18e6d8e33df440fa014bfa1aa451b445", '{"fields": [{"id": "L39FyvUohKDV", "properties": {}, "ref": "d8834652-3acf-4541-8354-1e3dcd716667", "title": "What did you think about the changes?", "type": "short_text"}, {"id": "krs82KgxHwGb", "properties": {}, "ref": "5b6e6796-635b-4595-9404-e81617d4540b", "title": "How useful is this feature turning out to be for you?", "type": "opinion_scale"}, {"id": "lBzHtCuzHFM4", "properties": {}, "ref": "b76be913-19b9-4b8a-b2ac-3fb645a65a5c", "title": "Your email address", "type": "email"}], "id": "SdzXVn", "title": "Google Shopping 5/4/18"}', '[{"field": {"id": "L39FyvUohKDV", "type": "short_text"}, "text": "t", "type": "text"}, {"field": {"id": "krs82KgxHwGb", "type": "opinion_scale"}, "number": 10, "type": "number"}, {"email": "t@t.com", "field": {"id": "lBzHtCuzHFM4", "type": "email"}, "type": "email"}]"' UNION ALL
SELECT "a63b258ce03360df691c9a949b2c57e3", '{"fields": [{"id": "krs82KgxHwGb", "properties": {}, "ref": "5b6e6796-635b-4595-9404-e81617d4540b", "title": "How useful is this feature turning out to be for you?", "type": "opinion_scale"}, {"id": "lBzHtCuzHFM4", "properties": {}, "ref": "b76be913-19b9-4b8a-b2ac-3fb645a65a5c", "title": "Your email address", "type": "email"}, {"id": "L39FyvUohKDV", "properties": {}, "ref": "d8834652-3acf-4541-8354-1e3dcd716667", "title": "What did you think about the changes?", "type": "short_text"}], "id": "SdzXVn", "title": "Google Shopping 5/4/18"}', '[{"field": {"id": "krs82KgxHwGb", "type": "opinion_scale"}, "number": 10, "type": "number"}, {"email": "someone@mail.com", "field": {"id": "lBzHtCuzHFM4", "type": "email"}, "type": "email"}, {"field": {"id": "L39FyvUohKDV", "type": "short_text"}, "text": "they were awesome", "type": "text"}]"' UNION ALL
SELECT "146c493c051a0a481cd5780839d3cdd6", '{"fields": [{"id": "CxhfK22a3XWE", "properties": {}, "ref": "d8834652-3acf-4541-8354-1e3dcd716667", "title": "What did you think about the changes?", "type": "short_text"}, {"id": "oUZxPRaKjmFr", "properties": {}, "ref": "5b6e6796-635b-4595-9404-e81617d4540b", "title": "How useful is this feature turning out to be for you?", "type": "opinion_scale"}, {"id": "zUIP73oXpLD6", "properties": {}, "ref": "b76be913-19b9-4b8a-b2ac-3fb645a65a5c", "title": "Your email address", "type": "email"}], "id": "kaiAsx", "title": "a - b"}', '[{"field": {"id": "CxhfK22a3XWE", "type": "short_text"}, "text": "nice", "type": "text"}, {"field": {"id": "oUZxPRaKjmFr", "type": "opinion_scale"}, "number": 2, "type": "number"}, {"email": "foo@bar.com", "field": {"id": "zUIP73oXpLD6", "type": "email"}, "type": "email"}]"'
)
SELECT token, id, title AS question,
JSON_EXTRACT_SCALAR(CONCAT('{',a,'}'), '$.type') answer_type,
COALESCE(JSON_EXTRACT_SCALAR(b, '$.text'),JSON_EXTRACT_SCALAR(b, '$.number'),JSON_EXTRACT_SCALAR(b, '$.email')) AS answer
FROM `project.dataset.table`,
UNNEST(REGEXP_EXTRACT_ALL(JSON_EXTRACT(questions, '$.fields'), r'"title":\s*"(.+?)"')) title WITH OFFSET pos1,
UNNEST(REGEXP_EXTRACT_ALL(JSON_EXTRACT(questions, '$.fields'), r'"id":\s*"(.+?)"')) id WITH OFFSET pos2,
UNNEST(REGEXP_EXTRACT_ALL(answers, r'"field":\s*{(.+?)}')) a WITH OFFSET pos3,
UNNEST(REGEXP_EXTRACT_ALL(REGEXP_REPLACE(answers, r'"field":\s*{.+?}', '"field": ""'), r'{.+?}')) b WITH OFFSET pos4
WHERE pos1 = pos2
AND pos3 = pos4
AND id = JSON_EXTRACT_SCALAR(CONCAT('{',a,'}'), '$.id')
输出
Row token id question answer_type answer
1 12345 1 Question 1? short_text answer 1
2 12345 2 Questions 2? opinion_scale 42
3 12345 3 Question 3? email an_account@example.com
4 18e6d8e33df440fa014bfa1aa451b445 L39FyvUohKDV What did you think about the changes? short_text t
5 18e6d8e33df440fa014bfa1aa451b445 krs82KgxHwGb How useful is this feature turning out to be for you? opinion_scale 10
6 18e6d8e33df440fa014bfa1aa451b445 lBzHtCuzHFM4 Your email address email t@t.com
7 a63b258ce03360df691c9a949b2c57e3 krs82KgxHwGb How useful is this feature turning out to be for you? opinion_scale 10
8 a63b258ce03360df691c9a949b2c57e3 lBzHtCuzHFM4 Your email address email someone@mail.com
9 a63b258ce03360df691c9a949b2c57e3 L39FyvUohKDV What did you think about the changes? short_text they were awesome
10 146c493c051a0a481cd5780839d3cdd6 CxhfK22a3XWE What did you think about the changes? short_text nice
11 146c493c051a0a481cd5780839d3cdd6 oUZxPRaKjmFr How useful is this feature turning out to be for you? opinion_scale 2
12 146c493c051a0a481cd5780839d3cdd6 zUIP73oXpLD6 Your email address email foo@bar.com
答案 1 :(得分：0)
如果您确定数组的长度，则可以先将它们数组ARRAY_CONCAT并使用串联版本执行UNNEST。它对我有用。