bigquery中的group by子句不起作用

Question

运行此查询时：

SELECT 
    date( time_ts ), 
    count(*) 
FROM 
    [bigquery-public-data:hacker_news.comments]
GROUP BY 
    date( time_ts)

我收到以下错误：

expression STRFTIME_UTC_USEC(INT64(PARSE_UTC_USEC(STRING([time_ts]))), '%Y-%m-%d') in GROUP BY is invalid

我如何纠正这个问题？

Answer 1

您需要为日期（time_ts）字段提供别名，然后按别名分组，以便：

SELECT 
date( time_ts ) as date, 
count(*) as count 
FROM [bigquery-public-data:hacker_news.comments] 
group by date