Select 如何在Google Big Query中使用SQL比较两个值？

我试图从Google Big Query数据库中获取在不同列中具有相同值的所有记录。比方说，当从手机发送一些事件时，我将变量

machine\u name

设置为firebase

user\u properties

。然后我将发送事件

event\u notification\u send

。当我查询表时，我想从数据库中获取所有数据，事件名为

event\u notification\u send

，它的参数

machine\u name

具有一些值X1，并且该记录必须同时在

user\u properties

中的键

Last\u notification

中具有一个参数，该参数的值为X1

如何进行SQL查询

谢谢

以下是我的代码示例：

#standardSQL
SELECT *
FROM 
`myProject.analytics_159820162.events_*`
WHERE
_TABLE_SUFFIX BETWEEN '20180725' AND '20180727' 
AND event_name in ("event_notification_received", "event_notification_dissmissed")
AND platform = "ANDROID"
AND
(SELECT COUNTIF((key = "machine_name")) 
              FROM UNNEST(event_params) 
) > 0  -- to see if specified event has such key
AND
(SELECT COUNTIF((key = "Last_notification")) 
              FROM UNNEST(user_properties) 
) > 0  -- to see if specified event has such key
ORDER BY event_timestamp ASC

---

要检查行/事件的参数“machine\u name”和“Last\u notification”是否具有相同的值，可以使用下面的语句

SELECT COUNT(DISTINCT key) cnt
FROM UNNEST(event_params) 
WHERE key IN ("machine_name", "Last_notification")
GROUP BY value
ORDER BY cnt DESC
LIMIT 1    

假设您的其余查询是正确的，下面将添加您的条件

#standardSQL
SELECT *
FROM `myProject.analytics_159820162.events_*`
WHERE _TABLE_SUFFIX BETWEEN '20180725' AND '20180727' 
AND event_name IN ("event_notification_received", "event_notification_dissmissed")
AND platform = "ANDROID"
AND (
    SELECT COUNT(DISTINCT key) cnt
    FROM UNNEST(event_params) 
    WHERE key IN ("machine_name", "Last_notification")
    GROUP BY value
    ORDER BY cnt DESC
    LIMIT 1
  ) = 2  
ORDER BY event_timestamp ASC   

注意：如果事件具有多个参数，且具有相同的键但值不同，则使用下面的方法只是为了安全起见

ORDER BY cnt DESC
LIMIT 1