问题描述
使用永久外部表查询Cloud Storage数据时,
CREATE OR REPLACE EXTERNAL TABLE mydataset.sales
OPTIONS (
format = 'CSV',uris = ['gs://mybucket/sales-google.csv','gs://mybucket/sales-microsoft.csv']
)
SELECT * FROM mydataset.sales
解决方法
您可以使用此处概述的_FILE_NAME伪列:
https://cloud.google.com/bigquery/external-data-drive#the_file_name_pseudo_column
,使用_FIE_NAME伪列:
SELECT
*,_FILE_NAME AS file_name
FROM mydataset.sales