hive复杂格式array,map,struct使用

-- 创建数据库表，以array作为数据类型
drop table if exists person;
create table person(
     name string
    ,work_locations array<string>
)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ' '
COLLECTION ITEMS TERMINATED BY ','
stored as textfile
;

-- 数据
biansutao beijing,shanghai,tianjin,hangzhou
linan changchu,chengdu,wuhan

-- 入库数据
LOAD DATA LOCAL INPATH 'tmpa' OVERWRITE INTO TABLE person;

-- 查询
select * from person;
select name from person;
select work_locations[0] from person;
select work_locations from person;
select work_locations[3] from person;
select work_locations[4] from person;

-- 创建数据库表
create table score(
     name string
    ,score map<string,int>
)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ' '
COLLECTION ITEMS TERMINATED BY ','
MAP KEYS TERMINATED BY ':'
stored as textfile
;

-- 数据
biansutao 数学:80,语文:89,英语:95
jobs 语文:60,数学:80,英语:99

-- 入库数据
LOAD DATA LOCAL INPATH 'tmpb' OVERWRITE INTO TABLE score;

-- 查询
select * from score;
select name from score;
select t.score from score t;
select t.score['语文'] from score t;
select t.score['英语'] from score t;

-- 创建数据表
CREATE TABLE test(
     id int
    ,course struct<course:string,score:int>
)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY ' '
COLLECTION ITEMS TERMINATED BY ','
stored as textfile
;

-- 数据
1 english,80
2 math,89
3 chinese,95

-- 入库
LOAD DATA LOCAL INPATH 'tmpc' OVERWRITE INTO TABLE test;

-- 查询
select * from test;
select course from test;
select t.course.course from test t; 
select t.course.score from test t;

-- 创建数据表 (异常)
create table test1(
     id int
    ,a MAP<STRING,ARRAY<STRING>>
)
row format delimited fields terminated by ' '
collection items terminated by ','
MAP KEYS TERMINATED BY ':'
stored as textfile
;

-- 数据
1 english:80,90,70
2 math:89,78,86
3 chinese:99,100,82

-- 入库
LOAD DATA LOCAL INPATH 'tmpd' OVERWRITE INTO TABLE test1;

-- 查询

ref: https://blog.csdn.net/u010670689/article/details/72885944

hive复杂格式array,map,struct使用

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