hive的补充

在配置文件hive.site.xml中

<!--表头-->
 <property>
    <name>hive.cli.print.header</name>
    <value>true</value>
   </property>
  <!--显示当前数据库-->
   <property>
    <name>hive.cli.print.current.db</name>
    <value>true</value>
  </property>

上传数据

bin/hdfs dfs -put ./data/sw17-top11-dl-sh.anon.csv /user/huadian

#加载数据
LOAD DATA  INPATH '/user/huadian/sw17-top11-dl-sh.anon.csv'  
INTO TABLE db_hive.tb_language_count

#使用Python开发大数据的人数 683 
select 
   count(*)
from 
   db_hive.tb_language_count
where 
   python="1" and spark_hadoop="1"

#使用R开发大数据的人数 606
 select 
   count(*) 
from 
   db_hive.tb_language_count
where 
   r="1" and spark_hadoop="1"

#合并

   select
   t1.p_c，t2.r_c
   from
   (select "1" as id ,count(*) as p_c from  db_hive.tb_language_count where python="1" and spark_hadoop="1"
   ) t1
   join
   (select "1" as id ,count(*) as r_c from db_hive.tb_language_count where r=1 and spark_hadoop="1"
   ) t2
   on t1.id = t2.id

以上是在控制台上输出的

创建表的另一种方式：根据结果创建表，讲有用的数据放在一个临时表中

create  table if not exists db_hive.tb_language_count_result
as
select count(*) from db_hive.tb_language_count where python="1" and spark_hadoop="1"

创建一张临时表

create table if not exists db_hive.tb_language_count_temp
as
select  
python,r,deep,spark_hadoop
from
db_hive.tb_language_count

hive的运行模式

当前回话设置有效：

所有会话都有效：
在配置文件中设置

 <property>
    <name>hive.exec.mode.local.auto</name>
    <value>true</value>
    <description>Let Hive determine whether to run in local mode automatically</description>
  </property>

bin/hive -e “一句sql语句”
bin/hive -f “xx.sql” :xx.sql中存放很多句sql语句

bin/hive -e "SELECT word,count(word) FROM db_hive.tb_word GROUP BY word"