show tables;

列出hive里面所有数据表名

desc userProfile;

显示数据表userProfile的基本表字段及字段type

desc extended trackinfo;

显示数据表trackinfo的详细信息，包括字段说明，数据表等

/usr/local/cloud/hive/bin/hive

进入hive数据库

select attribute_name from pms_attribute where attribute_id=21000 and attribute_value_id=105991;

hive的select操作

select user_id, category_id, catgory_pref, attribute_id, attribute_pref, attribute_value_id, attribute_value_pref from userProfile limit 10;

hive的select操作，只显示10行

/usr/local/cloud/hive/bin/hive -e "select category_id, attribute_id, count(user_id) from userProfile group by category_id, attribute_id" >> /home/deploy/recsys/workspace/ouyangyewei/statistics_data/number_attention_of_attribute_for_mobilePhone.csv;

将sql查询的数据导出到csv文件中