=================================================hive其他常用操作=====================================================
1.在hive操作界面 从hdfs上创建文件夹：
dfs -mkdir /student;
2.在hive界面内 将linux虚拟机本地数据上传到hdfs内：
dfs -put /opt/module/datas/student.txt /student;
3.加载本地文件到hive
load data local inpath '/opt/module/hive/datas/student.txt' into table default.student;
4.建表语句
create table if not exists location(
loc int,
loc_name string
)
row format delimited fields terminated by ' ';
5.将hive数据表导入到mysql
./sqoop export --connect jdbc:mysql://localhost:3306/data_result --username root --password 000000 --table result_2 --export-dir /user/hive/warehouse/db_result.db/data_2
=================================================hive数据库的操作=================================================
1.创建表时定义分隔符语句：
row format delimited fields terminated by ' ' (每一行中的元素用tab键分割)
2.创建数据时选择数据库在hdfs上的位置：
create database db_name location '/db_hive2.db';
3.过滤显示查询的数据库：
show databases like 'db_hive*';
4.显示数据库信息：
desc database db_name;
4.1 显示数据库的详细信息：
desc extended databases db_name;
5.切换数据库：
use db_name;
6.删除数据库(数据库是空时)：
drop database db_name;
6.1强制删除数据库(数据库不是空时)：
drop database db_name cascade;
================================================hive表的操作====================================================
1.建表语法：
CREATE [EXTERNAL] TABLE [IF NOT EXISTS] table_name
[(col_name data_type [COMMENT col_comment], ...)]
[COMMENT table_comment]
[PARTITIONED BY (col_name data_type [COMMENT col_comment], ...)]
[CLUSTERED BY (col_name, col_name, ...)
[SORTED BY (col_name [ASC|DESC], ...)] INTO num_buckets BUCKETS]
[ROW FORMAT row_format]
[STORED AS file_format]
[LOCATION hdfs_path]
[TBLPROPERTIES (property_name=property_value, ...)]
[AS select_statement]
2.普通建表语句：
create table if not exists student(
id int, name string
)
row format delimited fields terminated by ' '
stored as textfile
location '/user/hive/warehouse/student';
3.根据查询结果创建表:
create table if not exists student2 as select id, name from student;
4.根据已存在的表结构创建表：
create table if not exists student3 like student;
5.显示表的信息：
desc table_name;
6.加载本地文件到hive
load data local inpath '/opt/module/hive/datas/student.txt' into table default.student;
7.加载hdfs数据到hive:
load data inpath '/user/atguigu/hive/student.txt' into table default.student;
8.将查询结果导出到本地
insert overwrite local directory '/opt/module/hive/data/export/student' select * from student;
8.1将查询结果格式化导出到本地：
insert overwrite local directory
'/opt/module/hive/data/export/student1'
ROW FORMAT DELIMITED FIELDS TERMINATED BY ' '
select * from student;
9.1建库语句
create database db_hive;