hadoop学习之hive

Posted 2020-09-02

1.介绍：hive：数据仓库 解释器，编译器，优化器等

hive的命令整理http://blog.csdn.net/xiaoping8411/article/details/7605039

hive运行时，元数据存储在关系型数据库里面

需要安装一个关系型数据库(mysql)

 

2：hive创建表例子：

create table t_emp(
id int,
name string,
age int,
dept_name string
)
row format delimited
fields terminated by ‘,‘;

1,张三,33,销售部
2,张四,34,销售部
3,张唔,35,销售部
4,张六,36,销售部

select count(*) from t_emp where dept_name = ‘销售部‘ group by dept_name;

-----------------------------
create table t_person(
id int,
name string,
like array<string>,
tedian map<string,string>
)
row format delimited
fields terminated by ‘,‘

collection items terminated by ‘_‘

map keys terminated by ‘:‘;

1,zhangsan,sports_books_TV,sex:male_color:red

 

数据导入