Google bigquery Google BigQuery-基于一列获取唯一行

你有这个大疑问吗

select JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.clone_url") AS clone_url, JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language") AS language, integer(JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.stargazers_count")) as stars from githubarchive:day.20200115 where  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language")="C" group by language,clone_url,stars order by stars DESC limit 1000;

它返回多个带有唯一“星号”的“克隆url”条目

如何仅显示克隆url的最高唯一starcount

这个查询可以优化吗

以下是查询结果：

---

谢谢，

看起来您仍然在使用BigQuery遗留SQL-下面是遗留SQL

#legacySQL 
SELECT 
  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.clone_url") AS clone_url, 
  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language") AS language, 
  MAX(INTEGER(JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.stargazers_count"))) AS stars 
FROM [githubarchive:day.20200115]
WHERE  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language")="C" 
GROUP BY language, clone_url 
ORDER BY stars DESC 
LIMIT 1000  

请注意：强烈建议迁移到BigQuery标准SQL，因此上面的内容如下所示

#standardSQL
SELECT 
  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.clone_url") AS clone_url, 
  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language") AS language, 
  MAX(CAST(JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.stargazers_count") AS INT64)) AS stars 
FROM `githubarchive.day.20200115`
WHERE  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language")="C" 
GROUP BY language, clone_url 
ORDER BY stars DESC 
LIMIT 1000   

上述两个查询都将返回如下内容

---

看起来您仍然在使用BigQuery遗留SQL—下面是遗留SQL的介绍

#legacySQL 
SELECT 
  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.clone_url") AS clone_url, 
  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language") AS language, 
  MAX(INTEGER(JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.stargazers_count"))) AS stars 
FROM [githubarchive:day.20200115]
WHERE  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language")="C" 
GROUP BY language, clone_url 
ORDER BY stars DESC 
LIMIT 1000  

请注意：强烈建议迁移到BigQuery标准SQL，因此上面的内容如下所示

#standardSQL
SELECT 
  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.clone_url") AS clone_url, 
  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language") AS language, 
  MAX(CAST(JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.stargazers_count") AS INT64)) AS stars 
FROM `githubarchive.day.20200115`
WHERE  JSON_EXTRACT_SCALAR(payload, "$.pull_request.base.repo.language")="C" 
GROUP BY language, clone_url 
ORDER BY stars DESC 
LIMIT 1000   

上述两个查询都将返回如下内容