Hive总结，

Hive总结，

建表语句
1、分隔符：row format delimited fields terminated by ‘\t’
2、格式：stored as textfile
3、存储路径：location ‘/user/stu2’
4、根据查询结果创建表：create table stu3 as select * from stu2
5、根据已经存在的表结构创建表：create table stu4 like stu2
6、从hdfs加载数据：load data inpath ‘/hivedatas/techer.csv’ into table techer
7、分区表：partitioned by (month string)
8、本地加载数据到分区表：load data local inpath ‘/export/servers/hivedatas/score.csv’ into table score partition (month=‘201806’)
9、多分区查询：select * from score where month = ‘201806’ union all select * from score where month = ‘201807’
10、添加分区：alter table score add partition(month=‘201804’) partition(month = ‘201803’)
添加成功后就会多一个文件夹
11、外部表建立关联：msck repair table score4
12、在实际的项目开发当中，hive表的数据存储格式一般选择：orc或parquet。压缩方式一般选择snappy。