hive基本操作与应用

start-all.sh

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

hdfs dfs -put ./hello.txt wcinput
hdfs dfs -ls /user/hadoop/wcinput

hive

create table docs(line string);

load data inpath ‘/user/hadoop/wcinput/hello.txt‘ overwrite into table docs;
select * from docs;

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

 show tables;
select * from word_count;