Mapping subquery and aggregate functions

映射子查询和聚合功能

youdao

A third method is to have the summary tables rebuilt after the ETL process using SQL sum and aggregate functions.

第三种方法是在ETL流程之后使用SQL SUM和汇总函数来重构汇总表。

youdao

I can then use built-in aggregate functions on the array to get the size and sum of those days overdue and compute an average.

然后我可以使用内置的聚合函数来获取过期天数的大小和总和并计算平均值。

youdao

Just as homomorphic encryption allows people to aggregate two functions without knowing the original input, new data mining technologies may allow meaningful statistical results without access to original raw user data.

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