摘要:
1. 文件存储格式 TextFile SequeceFile RCFile ORCFile PARQuet 2. 说明 |格式|导入数据方式| |--|--| |textfile|将数据文件直接拷贝到hdfs上,不进行处理| |SequenceFile, RCFile, ORCFile, PARQu 阅读全文
摘要:
sql语句 (SELECT * FROM t1 WHERE {subquery_where_condition}) a JOIN (SELECT * FROM t2 WHERE {subquery_where_condition}) b ON {on_condition} WHERE {where_ 阅读全文