第67课：Spark SQL下采用Java和Scala实现Join的案例综合实战（巩固前面学习的Spark SQL知识）

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源文件

{"name":"Michael", "score":90}
{"name":"Andy", "score":80}
{"name":"Justin", "score":99}
{"name":"zhangsan", "score":100}
{"name":"zhangsan", "score":96}