1 Array的使用
創建數據庫表，以array作爲數據類型
create table person(name string,work_locations array<string>)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY '\t'
COLLECTION ITEMS TERMINATED BY ',';
數據
biansutao beijing,shanghai,tianjin,hangzhou
linan changchu,chengdu,wuhan
入庫數據
LOAD DATA LOCAL INPATH '/home/Hadoop/person.txt' OVERWRITE INTO TABLE person;
查詢
hive> select * from person;
biansutao ["beijing","shanghai","tianjin","hangzhou"]
linan ["changchu","chengdu","wuhan"]
Time taken: 0.355 seconds
hive> select name from person;
linan
biansutao
Time taken: 12.397 seconds
hive> select work_locations[0] from person;
changchu
beijing
Time taken: 13.214 seconds
hive> select work_locations from person;
["changchu","chengdu","wuhan"]
["beijing","shanghai","tianjin","hangzhou"]
Time taken: 13.755 seconds
hive> select work_locations[3] from person;
NULL
hangzhou
Time taken: 12.722 seconds
hive> select work_locations[4] from person;
NULL
NULL
Time taken: 15.958 seconds
2 Map的使用
創建數據庫表
create table score(name string, score map<string,int>)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY '\t'
COLLECTION ITEMS TERMINATED BY ','
MAP KEYS TERMINATED BY ':';
數據
biansutao '數學':80,'語文':89,'英語':95
jobs '語文':60,'數學':80,'英語':99
入庫數據
LOAD DATA LOCAL INPATH '/home/hadoop/score.txt' OVERWRITE INTO TABLE score;
查詢
hive> select * from score;
biansutao {"數學":80,"語文":89,"英語":95}
jobs {"語文":60,"數學":80,"英語":99}
Time taken: 0.665 seconds
hive> select name from score;
jobs
biansutao
Time taken: 19.778 seconds
hive> select t.score from score t;
{"語文":60,"數學":80,"英語":99}
{"數學":80,"語文":89,"英語":95}
Time taken: 19.353 seconds
hive> select t.score['語文'] from score t;
60
89
Time taken: 13.054 seconds
hive> select t.score['英語'] from score t;
99
95
Time taken: 13.769 seconds
3 Struct的使用
創建數據表
CREATE TABLE test(id int,course struct<course:string,score:int>)
ROW FORMAT DELIMITED
FIELDS TERMINATED BY '\t'
COLLECTION ITEMS TERMINATED BY ',';
數據
1 english,80
2 math,89
3 chinese,95
入庫
LOAD DATA LOCAL INPATH '/home/hadoop/test.txt' OVERWRITE INTO TABLE test;
查詢
hive> select * from test;
OK
1 {"course":"english","score":80}
2 {"course":"math","score":89}
3 {"course":"chinese","score":95}
Time taken: 0.275 seconds
hive> select course from test;
{"course":"english","score":80}
{"course":"math","score":89}
{"course":"chinese","score":95}
Time taken: 44.968 seconds
select t.course.course from test t;
english
math
chinese
Time taken: 15.827 seconds
hive> select t.course.score from test t;
80
89
95
Time taken: 13.235 seconds
4 數據組合（不支持組合的複雜數據類型）
LOAD DATA LOCAL INPATH '/home/hadoop/test.txt' OVERWRITE INTO TABLE test;
create table test1(id int,a MAP<STRING,ARRAY<STRING>>)
row format delimited fields terminated by '\t'
collection items terminated by ','
MAP KEYS TERMINATED BY ':';
1 english:80,90,70
2 math:89,78,86
3 chinese:99,100,82
LOAD DATA LOCAL INPATH '/home/hadoop/test1.txt' OVERWRITE INTO TABLE test1;
原貼地址：http://blog.csdn.net/wf1982/article/details/7474601