启动源服务
hive --service metastore
ss -nal 查看端口
CREATE TABLE student2(
id int,
name string,
sex string,
age int
)
row format delimited
fields terminated by ',';
create table students(
student_name string ,
likes array<string>,
address map<string,string>
)
row format delimited
fields terminated by ','
collection items terminated by '-'
map keys terminated by ':';
查看数据表结构
desc formatted students;
OK
col_name data_type comment
student_name string
likes array<string>
address map<string,string>
Detailed Table Information
Database: default
Owner: root
CreateTime: Fri Jul 17 10:15:34 EDT 2020
LastAccessTime: UNKNOWN
Retention: 0
Location: hdfs://mycluster/hive/warehouse/students
Table Type: MANAGED_TABLE
Table Parameters:
COLUMN_STATS_ACCURATE {\"BASIC_STATS\":\"true\"}
numFiles 0
numRows 0
rawDataSize 0
totalSize 0
transient_lastDdlTime 1594995334
Storage Information
SerDe Library: org.apache.hadoop.hive.serde2.lazy.LazySimpleSerDe
InputFormat: org.apache.hadoop.mapred.TextInputFormat
OutputFormat: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat
Compressed: No
Num Buckets: -1
Bucket Columns: \[\]
Sort Columns: \[\]
Storage Desc Params:
colelction.delim -
field.delim ,
mapkey.delim :
serialization.format ,
Time taken: 0.136 seconds, Fetched: 35 row(s)
zhangsan,1-2-3,shanxi:shanxi-xian-yanta:luonan
zhangsan,1-2-3,shaaxi:shanxi-xian-yanta:luona
zhangsan,1-2-3,sichuan:shanxi-xian-yanta:luona
zhangsan,1-2-3,henan:shanxi-xian-yanta:luona
zhangsan,1-2-3,hebei:shanxi-xian-yanta:luona
hive 默认的分割符
内部表和外部表的区别
内部表创建有默认存储位置，外部表需要指定路径
内部表删除元数据和数据，外部表只删除元数据，不删除数据
单 分区
create table students2(
student_name string ,
likes array<string>,
address map<string,string>
)
partitioned by (age int)
row format delimited
fields terminated by ','
collection items terminated by '-'
map keys terminated by ':';