ABC三個hive表 每個表中都只有一列int類型且列名相同，求三個表中互不重復的數
create table a(age int)
row format delimited
fields terminated by ',';
create table b(age int)
row format delimited
fields terminated by ',';
create table c(age int)
row format delimited
fields terminated by ',';
a.txt
1
2
3
4
5
6
7
8
9
b.txt
2
3
11
12
14
15
16
18
35
6
7
8
c.txt
1
2
3
11
5
6
7
8
20
30
40
sql：
select * from (select a.* from a full outer join b on a.age=b.age full outer join c on a.age =c.age where (a.age is not null and b.age is null and c.age is null) or (b.age is not null and a.age is null and c.age is null) or (c.age is not null and a.age is null and b.age is null) union select b.* from b full outer join a on a.age=b.age full outer join c on b.age =c.age where (a.age is not null and b.age is null and c.age is null) or (b.age is not null and a.age is null and c.age is null) or (c.age is not null and a.age is null and b.age is null) union select c.* from c full outer join b on c.age=b.age full outer join a on a.age =c.age where (a.age is not null and b.age is null and c.age is null) or (b.age is not null and a.age is null and c.age is null) or (c.age is not null and a.age is null and b.age is null)) d where d.age is not null ;
運行結果：
sql:
select age,count(age) as c1 from (select age from a union all select age from b union all select age from c) t_union group by age having c1=1;
