在BigQuery中,我有一个查询,它使用RANK()
函数按来源的总计数对用户进行分组。我只关心前10名用户。目前,我在子选择中执行RANK()
函数,WHERE
子句存在于父查询中以限制结果。有人可以向我解释如何在没有父查询的情况下完成此操作吗?我想要运行的查询如下所示:
SELECT source, user, count( tweet_id ) as total, max( friends ) as friends,
RANK() OVER (PARTITION BY source ORDER BY total DESC, friends DESC ) as user_rank
FROM tweets
GROUP BY source, user
HAVING user_rank <= 10
但我收到错误:表'推文'中找不到字段'user_rank'。我可以ORDER BY
使用user_rank,而不是过滤。
感谢您的任何建议!
答案 0 :(得分:4)
您可能需要执行类似
的操作SELECT source, user, total, friends, user_rank
FROM (
SELECT source, user, count( tweet_id ) as total, max( friends ) as friends,
RANK() OVER (PARTITION BY source ORDER BY total DESC, friends DESC ) as user_rank
FROM tweets
GROUP BY source, user
)
HAVING user_rank <= 10