排名函数(Ranking functions): 根据某个规则对数据集中的数据项排名,常见函数有RANK, DENSE_RANK, CUME_DIST, PERCENT_RANK, NTILE;
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... --更新top 排序函数 Ranking Functions 通用表表达式 Common Table Expressions ...
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Doug Cutting (DC) : Yahoo! Regularly USES Hadoop for research tasks to improve its products and services such as ranking functions, AD targeting, etc.
Doug Cutting (DC): Yahoo定期在搜索业务上使用Hadoop来提高其产品和服务,如排名功能和目标广告等。
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