standardSQL：無法從時間戳

Question

提取一天我不能叫repository.created_at與EXTRACT()功能時間戳變數中擷取天。

#standardSQL 
SELECT repository.created_at AS fechas, 
     EXTRACT(DAY FROM DATE repository.created_at) 
FROM `bigquery-public-data.samples.github_nested` 
LIMIT 100 

如何解決？

Answer 1

#standardSQL 
SELECT 
    repository.created_at AS fechas, 
    EXTRACT(DAY FROM PARSE_TIMESTAMP('%Y/%m/%d %X %z', repository.created_at)) 
FROM `bigquery-public-data.samples.github_nested` 
LIMIT 100 

Answer 2

字段repository.created_at是字符串類型。在提取一天之前，您需要將其解析爲日期。

這應該工作：

SELECT repository.created_at AS fechas, 
     EXTRACT(DAY FROM PARSE_DATE("%Y/%m/%d", 
SUBSTR(repository.created_at, 0, 10))) 
FROM `bigquery-public-data.samples.github_nested` 
LIMIT 100