一、Array类型
1、数据示例
2、实操
元数据
zhangsan beijing,shanghai,tianjin,hangzhou
wangwu changchun,chengdu,wuhan,beijin
创建表
CREATE TABLE myhive.test_array(name string, work_locations array<string>)
ROW FORMAT DELIMITED FIELDS TERMINATED BY '\t'
COLLECTION ITEMS TERMINATED BY ',';
COLLECTION ITEMS TERMINATED BY ','
表示集合(array
)元素的分隔符是逗号
加载数据
load data local inpath '/home/atguigu/data_for_array_type.txt' overwrite into table myhive.test_array;
常用查询语句
-- 查询loction数组中第一个元素
select name, work_locations[0] location from myhive.test_array;
-- 查询location数组中元素的个数
select name, size(work_locations) location from myhive.test_array;
-- 查询location数组中包含tianjin的信息
select * from myhive.test_array where array_contains(work_locations,'tianjin');
二、Map类型
1、数据示例
2、实操
元数据
1,林杰均,father:林大明#mother:小甜甜#brother:小甜,28
2,周杰伦,father:马小云#mother:黄大奕#brother:小天,22
3,王葱,father:王林#mother:如花#sister:潇潇,29
4,马大云,father:周街轮#mother:美美,26
创建表
CREATE TABLE myhive.test_map(id int, name string, members map<string,string>, age int)
ROW FORMAT DELIMITED FIELDS TERMINATED BY ','
COLLECTION ITEMS TERMINATED BY '#'
MAP KEYS TERMINATED BY ':';
不同键值对之间:COLLECTION ITEMS TERMINATED BY '分隔符'
分隔
一个键值对内,使用: MAP KEYS TERMINATED BY '分隔符'
分隔K-V
加载数据
load data local inpath '/home/atguigu/data_for_map_type.txt' overwrite into table myhive.test_map;
常用查询语句
-- 查询father、mother这两个map的key
select id, name, members['father'] father, members['mother'] mother, age from myhive.test_map;
-- 查询全部map的key,使用map_keys函数,结果是array类型
select id, name, map_keys(members) as relation from myhive.test_map;
-- 查询全部map的value,使用map_values函数,结果是array类型
select id, name, map_values(members) as relation from myhive.test_map;
-- 查询map类型的KV对数量
select id,name,size(members) num from myhive.test_map;
-- 查询map的key中有brother的数据
select * from myhive.test_map where array_contains(map_keys(members), 'brother');
三、Struct类型
1、数据示例
2、实操
元数据
1#周杰轮:11
2#林均杰:16
3#刘德滑:21
4#张学油:26
5#蔡依临:23
创建表
CREATE TABLE myhive.test_struct(id string, info struct<name:string, age:int>)
ROW FORMAT DELIMITED FIELDS TERMINATED BY '#'
COLLECTION ITEMS TERMINATED BY ':';
加载数据
load data local inpath '/home/atguigu/data_for_struct_type.txt' overwrite into table myhive.test_struct;
常用查询语句
# 直接使用列名.子列名 即可从struct中取出子列查询
select id, info.name from test_struct;