0

我有在 MySQL 中可以正常工作的 sql 脚本，但是我无法在 google bigquery 中工作。通读 bq 文档后，我做了一些调整（例如，每个 select 语句不超过一个 join），但脚本仍然失败。任何帮助表示赞赏。如果您知道 bq sql 与其他 sql 方面的任何好的资源，那也将不胜感激。谢谢。

SELECT 
T1.action_date AS action_date,
T1.ad_campaign_category AS ad_campaign_category,
T1.campaign_id AS campaign_id,
T2.total_sends AS total_sends, 
count(*) AS clicks_per_category
FROM ( 
    SELECT action_date, campaign_id, ad_campaign_category
    FROM projectX.email_action
    WHERE action_date > '2009-04-01' AND action_date < '2011-05-01') T1,

    (
    SELECT action_date, campaign_id, ad_campaign_category, count(*) AS total_sends
    FROM projectX.email_action
    WHERE action_type = 'send' AND action_date > '2009-04-01' AND action_date < '2011-05-01'
    GROUP BY action_date, campaign_id) T2

WHERE T1.action_date = T2.action_date 
    AND T1.campaign_id = T2.campaign_id
GROUP BY action_date, campaign_id, ad_campaign_category
4

1 回答 1

3

JOIN 必须是显式的——也就是说，而不是使用SELECT ... FROM (...) t1, (...) t2 WHERE t1.x = t2.y您应该使用表单SELECT ... FROM (...) t1 JOIN (...) t2 ON t1.x = t2.y 对于您的示例，这看起来像：

SELECT 
T1.action_date AS action_date,
T1.ad_campaign_category AS ad_campaign_category,
T1.campaign_id AS campaign_id,
T2.total_sends AS total_sends, 
count(*) AS clicks_per_category
FROM ( 
    SELECT action_date, campaign_id, ad_campaign_category
    FROM projectX.email_action
    WHERE action_date > '2009-04-01' AND action_date < '2011-05-01') T1
JOIN (
    SELECT action_date, campaign_id, ad_campaign_category, count(*) AS total_sends
    FROM projectX.email_action
    WHERE action_type = 'send' AND action_date > '2009-04-01' AND action_date < '2011-05-01'
    GROUP BY action_date, campaign_id) T2
ON T1.action_date = T2.action_date 
AND T1.campaign_id = T2.campaign_id
GROUP BY action_date, campaign_id, ad_campaign_category

请注意，如果您收到一个表太大的错误，请尝试使用JOIN EACH而不是JOIN.

于 2013-02-27T22:44:43.843 回答