[英]Error when trying to select event data with BigQuery
我正在尝试在BigQuery中选择event_dim.date
,但由于错误而无法实际访问它
Error: Cannot access field date on a value with type ARRAY<STRUCT<date STRING, name STRING, params ARRAY<STRUCT<key STRING, value STRUCT<string_value STRING, int_value INT64, float_value FLOAT, ...>>>, ...>> at [1:18]
我的查询:
SELECT event_dim.date FROM `table`
我知道我做错了,任何帮助将不胜感激。 谢谢!
您是否要获取每一行的日期数组? 然后,您需要一个ARRAY子查询:
SELECT ARRAY(SELECT date FROM UNNEST(event_dim)) AS dates
FROM `table`;
如果试图将所有日期放在单独的行中,那么您想与数组交叉连接:
SELECT event.date
FROM `table`
CROSS JOIN UNNEST(event_dim) AS event;
要过滤特定日期:
SELECT event.date
FROM `table`
CROSS JOIN UNNEST(event_dim) AS event
WHERE event.date = '20170104';
或者,您可以将日期字符串解析为date
类型,以便按年份或星期进行过滤,例如:
SELECT date
FROM (
SELECT PARSE_DATE('%Y%m%d', event.date) AS date
FROM `table`
CROSS JOIN UNNEST(event_dim) AS event
)
WHERE EXTRACT(YEAR FROM date) = 2017;
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