hive基本操作与应用

ssh localhost
cd /usr/local/hadoop
./sbin/start-dfs.sh
cd /usr/local/hive/lib
service mysql start
start-all.sh

hdfs dfs -mkdir demo
hdfs dfs -ls /user/hadoop

hdfs dfs -put ./123.txt demo
hdfs dfs -ls /user/hadoop/demo

hive

create table docs(line string)

load data inpath ‘/user/hadoop/demo/123.txt‘ overwrite into table docs
select * from docs

create table word_count as select word,count(1) as count from (select explode(split(line," ")) as word from docs) word group by word order by word;

show tables;
select * from word_count;