[hive] hive 内部表和外部表

1.内部表

hive (test1)> create table com_inner_person(id int,name string,age int,ctime timestamp) row format delimited fields terminated by ',';
OK
Time taken: 0.233 seconds
hive (test1)> load data local inpath '/opt/hadoop/person.data' into table com_inner_person;
Loading data to table test1.com_inner_person
Table test1.com_inner_person stats: [numFiles=1, totalSize=142]
OK
Time taken: 0.602 seconds
hive (test1)> select * from com_inner_person;
OK
1       王思琪  12      NULL
2       张三    13      NULL
3       王丽    43      NULL
4       三四    23      NULL
5       Python  12      NULL
Time taken: 0.075 seconds, Fetched: 5 row(s)

删除表后，数据也一起删除。 

2.外部表

hive (test1)> create external table com_ext_person (id int,name string,age int,ctime timestamp) row format delimited fields terminated by ',' location '/opt/hadoop/external';
OK
Time taken: 0.205 seconds
hive (test1)> load data local inpath '/opt/hadoop/person.data' into table com_ext_person;
Loading data to table test1.com_ext_person
Table test1.com_ext_person stats: [numFiles=0, totalSize=0]
OK
Time taken: 0.512 seconds
hive (test1)> select * from com_ext_person;
OK
1       王思琪  12      NULL
2       张三    13      NULL
3       王丽    43      NULL
4       三四    23      NULL
5       Python  12      NULL
6       spark   32      NULL
Time taken: 0.086 seconds, Fetched: 6 row(s)

 在指定的location中查看hdfs数据

删除表后，数据仍在。