(1)基本类型
数据类型 | 所占字节 | 开始支持版本 |
TINYINT | 1byte,-128 ~ 127 | |
SMALLINT | 2byte,-32,768 ~ 32,767 | |
INT | 4byte,-2,147,483,648 ~ 2,147,483,647 | |
BIGINT | 8byte,-9,223,372,036,854,775,808 ~ 9,223,372,036,854,775,807 | |
BOOLEAN | |
|
FLOAT | 4byte单精度 | |
DOUBLE | 8byte双精度 | |
STRING | |
|
BINARY | |
从Hive0.8.0开始支持 |
TIMESTAMP | |
从Hive0.8.0开始支持 |
(2)混合类型:
Array |
|
Array(“test1”,”test2”) |
Map |
MAP包含key->value键值对,可以通过key来访问元素。比如”userlist”是一个map类型,其中username是key,password是value;那么我们可以通过userlist['username']来得到这个用户对应的password; |
map(“username”,”zhu”) |
Struct |
STRUCT可以包含不同数据类型的元素。这些元素可以通过”点语法”的方式来得到所需要的元素,比如user是一个STRUCT类型,那么可以通过user.address得到这个用户的地址。 |
struct(“zhu”,”2428922) |
CREATE TABLE employees ( name STRING, salary FLOAT, subordinates ARRAY<STRING>, deductions MAP<STRING, FLOAT>, address STRUCT<street:STRING, city:STRING, state:STRING, zip:INT> ) PARTITIONED BY (country STRING, state STRING);
指定分割标记:
CREATE TABLE employees ( name STRING, salary FLOAT, subordinates ARRAY<STRING>, deductions MAP<STRING, FLOAT>, address STRUCT<street:STRING, city:STRING, state:STRING, zip:INT> ) PARTITIONED BY (country STRING, state STRING); row formate delimited fields terminated by ',';