#Hive建外部External表（外部表external table）：

CREATE EXTERNAL TABLE `table_name`(
  `column1` string,
  `column2` string,
  `column3` string)
PARTITIONED BY (
  `proc_date` string)
ROW FORMAT SERDE
  ‘org.apache.hadoop.hive.ql.io.parquet.serde.ParquetHiveSerDe’
STORED AS INPUTFORMAT
  ‘org.apache.hadoop.hive.ql.io.parquet.MapredParquetInputFormat’
OUTPUTFORMAT
  ‘org.apache.hadoop.hive.ql.io.parquet.MapredParquetOutputFormat’
LOCATION
  ‘hdfs://hdfscluster/…’
TBLPROPERTIES ( ‘orc.compress’=’snappy’);

#

#

#添加分区并加载分区数据：

alter table table_name add partition (proc_date=’${hivevar:pdate}’) location ‘…’（不改变源数据存储位置）

alter table table_name add if not exsit partition (proc_date=’${hivevar:pdate}’) location ‘hdfs://hdfscluster/’

load data inpath ‘…’ into table table_name partition(proc_date=’${hivevar:pdate}’);（会将源数据切到hive表指定的路径下）

#删除分区：alter table table_name drop if exists partition(proc_date=’${hivevar:pdate}’);

#