hive基本操作与应用

start-all.sh

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

hdfs dfs -put ./test.txt testinput
hdfs dfs -ls /user/hadoop/testinput

hive

create table docs(line string);<br>show tables;

load data inpath ‘/user/hadoop/testinput/test.txt‘ overwrite into table docs;

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

select * from word_count;