Hive 中各种Join 操作及实例

数据
建表
操作

正文：

1、数据

a:
+-------+---------+--+
| a.id | a.name |
+-------+---------+--+
| 1 | a |
| 2 | b |
| 3 | c |
| 4 | d |
| 7 | y |
| 8 | u |
+-------+---------+--+

b:
+-------+---------+--+
| b.id | b.name |
+-------+---------+--+
| 2 | bb |
| 3 | cc |
| 7 | yy |
| 9 | pp |
+-------+---------+--+

2、建表

create table a(id int,name string)
row format delimited
fields terminated by ',';

create table b(id int,name string)
row format delimited
fields terminated by ',';

load data local inpath '/home/hadoop/a.txt' into table a;
load data local inpath '/home/hadoop/b.txt' into table b;

3、操作

inner join 操作

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select * from a inner join b on a.id=b.id;

+-------+---------+-------+---------+--+
| a.id | a.name | b.id | b.name |
+-------+---------+-------+---------+--+
| 2 | b | 2 | bb |
| 3 | c | 3 | cc |
| 7 | y | 7 | yy |
+-------+---------+-------+---------+--+

left join 操作

select * from a left join b on a.id=b.id;

+-------+---------+-------+---------+--+
| a.id | a.name | b.id | b.name |
+-------+---------+-------+---------+--+
| 1 | a | NULL | NULL |
| 2 | b | 2 | bb |
| 3 | c | 3 | cc |
| 4 | d | NULL | NULL |
| 7 | y | 7 | yy |
| 8 | u | NULL | NULL |
+-------+---------+-------+---------+--+

right join 操作

select * from a right join b on a.id=b.id;

+-------+---------+-------+---------+--+
| a.id | a.name | b.id | b.name |
+-------+---------+-------+---------+--+
| 2 | b | 2 | bb |
| 3 | c | 3 | cc |
| 7 | y | 7 | yy |
| NULL | NULL | 9 | pp |
+-------+---------+-------+---------+--+

full outer join 操作

select * from a full outer join b on a.id=b.id;

left semi 操作

select * from a left semi join b on a.id=b.id;

+-------+---------+--+
| a.id | a.name |
+-------+---------+--+
| 2 | b |
| 3 | c |
| 7 | y |
+-------+---------+--+

select * from b left semi join a on a.id=b.id;

+-------+---------+--+
| b.id | b.name |
+-------+---------+--+
| 2 | bb |
| 3 | cc |
| 7 | yy |
+-------+---------+--+

Hive 中 各种Join 操作及实例

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Hive 中各种Join 操作及实例