Question

我试图从Google的BigQuery中的多个表中进行查询。我收到了错误＆＃34; Field＆＃39; w.max_temperature＆＃39;表格＆＃39; weather.stations＆＃39;中没有找到。＆＃34;

这是我的SQL：

SELECT w.station_number, s.LAT, s.LON, w.year, w.month, avg(w.mean_temp) as [mean temp], max(w.max_temperature) as [max temp], min(w.min_temperature) as [min temp], avg(w.mean_visibility) as [avg visbility] FROM [weather.stations] s, [publicdata:samples.gsod] w WHERE w.station_number=s.USAF AND w.wban_number=s.WBAN GROUP BY w.month, w.year, w.station_number, s.LAT, s.LON;

我试图引用＆＃34; max_temperature＆＃34;至[publicdata：samples.gsod]，但无论出于何种原因，它都将其引用到[weather.stations]。有任何想法吗？谢谢！

Answer 1

听起来你正在尝试进行JOIN，但在BigQuery SQL中，以逗号分隔的表列表表示UNION ALL而不是JOIN（是的，它很奇怪;是的，如果我们可能会改变它可能，但现在可能为时已晚。）

您最想要的是：

SELECT w.station_number, s.LAT, s.LON, w.year, w.month, 
       avg(w.mean_temp) as [mean temp], max(w.max_temperature) as [max temp], 
       min(w.min_temperature) as [min temp], 
       avg(w.mean_visibility) as [avg visbility]
FROM [weather.stations] s, 
JOIN [publicdata:samples.gsod] w
ON w.station_number=s.USAF AND w.wban_number=s.WBAN 
GROUP BY w.month, w.year, w.station_number, s.LAT, s.LON;

Big Query多个表

1 个答案: