Hive练习

Posted 2020-09-23 Super_Orco

一、基础DDL练习

SHOW DATABASES;

CREATE DATABASE IF NOT EXISTS db1 COMMENT ‘Our database db1‘;

SHOW DATABASES;

DESCRIBE DATABASE db1;

CREATE TABLE db1.table1 (word STRING, count INT);

SHOW TABLES in db1;

DESCRIBE db1.table1;

USE db1;

SHOW TABLES;

SELECT * FROM db1.table1;

DROP TABLE table1;

DROP DATABASE db1;

USE default;

二、基础DML语句

创建表
create table if not exists user_dimension (
 uid STRING,
 name STRING,
 gender STRING,
 birth DATE,
 province STRING
)ROW FORMAT DELIMITED //按行切分的意思
 FIELDS TERMINATED BY ‘,‘  //按逗号分隔的
查看表信息
describe user_dimension;

show create table user_dimension;

查看所有表
show tables;

载入本地数据
load data local inpath ‘/home/orco/tempdata/user.data‘ overwrite into table user_dimension;

载入HDFS上的数据
load data inpath ‘/user/orco/practice_1/user.data‘ overwrite into table user_dimension;

验证
select * from user_dimension;

查看hive在hdfs上的存储目录
hadoop fs -ls /warehouse/
hadoop fs -ls /warehouse/user_dimension

三、复杂数据类型