hive常用语句

1.表数据备份 "备份到备份表中，执行以下操作，其中nginx_log_info_20180724 为备份表

create table nginx_log_info_20180724 as select * from nginx_log_info;

2.查看表结构 "1.show create table 表名；

3.describe 表名

4.---查询分区字段：  show partitions pdm.trd_ta_dividend;

hive添加数据 INSERT INTO flt_ip_agency_hbs(key,sk_agency,agencyno,agency_name) VALUES ("20201105_135991","135991","000","诸菏酒类包装厂")

5.数据量大的时候在root下运行，统计记录数（适用于千万级数据量，利用了hbase jar中自带的统计行数的工具类） hbase org.apache.hadoop.hbase.mapreduce.RowCounter 'flt_ass_cust_fundbal_hbs'

6.从Ａ查询数据写入到Ｂ表 "１.insert into  pub.flt_agrm_tradeacco_reg (bk_fundaccount,bk_tradeaccount ) SELECT bk_fundaccount,bk_tradeaccount  FROM pub.flt_agrm_tradeacco_reg001 limit 10;

7.insert into pub.flt_agrm_tradeacco_reg　select * from  pub.flt_agrm_tradeacco_reg001;"

8.查询分区字段 show partitions pdm.trd_ta_dividend;

9.hive环境认证 kinit -k -t /etc/hive.keytab hive

10.导出数据 hive -e "select  bk_fundaccount,sk_invpty_of_cust,bk_invpty_of_cust from pub.flt_agrm_fundaccount"  > /tmp/flt_agrm_fundaccount.txt ；

11.在hive上建一张外部表 "

create external table if not exists fun_user_external (

    tid INT,

    userid STRING,

    pwd STRING,

    create_time BIGINT,

    email STRING

) ROW FORMAT DELIMITED FIELDS TERMINATED BY '`' STORED AS TEXTFILE"