hive和hdfs

创建外部表employee
create table employee(
user_id int,
username string,
dept_id int)
row format delimited fields terminated by ','  
stored as textfile ;

装载数据

load data inpath '/ict01/department.txt' into table department.txt;

连接操作

select e.username,d.dept_name,s.salarys 
from cx_table_employee e 
join cx_table_department d 
on e.dept_id = d.dept_id 
join cx_table_salary s 
on e.user_id = s.userid;