Question

我正在尝试从查询中创建一个新表，在此过程中强制转换嵌套字段之一。像这样：

#standardSQL    
SELECT * EXCEPT (bid_info),
  (SELECT AS STRUCT bid_info.* EXCEPT (clicks), CAST(bid_info.clicks AS NUMERIC) as clicks 
  FROM `testing.fb_ads.ads`) as bid_info
FROM `testing.fb_ads.ads`

我收到错误消息“标量子查询产生了多个元素”，并且查询执行似乎没有结束。

如何解决此查询？

Answer 1

所以，我毕竟找到了解决方案，就可以了：

SELECT * EXCEPT (bid_info),
(SELECT AS STRUCT bid_info.* EXCEPT (clicks), CAST(bid_info.clicks AS NUMERIC) as clicks ) as bid_info
FROM `testing.fb_ads.ads`

如何通过CAST更改BigQuery中的嵌套字段的类型？

1 个答案: