I have traveled many countries. Be crazy in techniques and Tango! I think I should be a historian or racing driver!I live in Chicago but I'm a fun of Phila 76ers.
IP属地:上海
窗口函数往往用在电商
难点,加强
关键字 clustered by (id)
多表连接时,hive总是按照从左到右的顺序执行的,当3个表连接时,如表a b c,a b的输出mapreduce job,和c进行连接。
公司常用orc存储方式和snappy压缩方式 orc存储文件默认zlib压缩,而snappy的压缩效率比zlib高 具体实际项目,hive表数据存储格式一般选择orc或par...