题目内容
(请给出正确答案)
[单选题]
Spark中DataFrame的()方法是进行分组查询。
A.orderby
B.groupby
C.selectby
D.sortby
答案
查看答案
A.orderby
B.groupby
C.selectby
D.sortby
第3题
性经过变换生成新的图。()
此题为判断题(对,错)。
第7题
By "if the fuel isn't there, the spark is useless", the author means______.
A.carbohydrates, protein and fat are enough to sustain a human life
B.vitamins and minerals are virtually of no value
C.carbohydrates, protein and fat are as important as vitamins and minerals
D.without carbohydrates, protein and fat, vitamins and minerals are of no use
第9题
A.RDD具有血统机制(Lineage)
B.RDD默认存储在磁盘
C.RDD是一个只读的,可分区的分布式数据集
D.RDD是Spark对基础数据的抽象