Hive query Join tables based on ID

Question

Hello,
I have 2 tables as below with the data loaded as below, I need a query to join 2 tables on id whenever the charge is -ve values, there should not be any duplicate values 
ex:id 20 has 2 transactions each with charge -1:00 since the charge is -ve we should not see duplicate values in the joined query for id 20.
Please help me with the query

create table a1
(
id int,
name string
)
row format delimited fields terminated by ","
stored as textfile

create table b1
(
id int,
charge float
)
row format delimited fields terminated by ","
stored as textfile


INSERT INTO a1 values 
(10, "sant"),
(20, "suvi"),
(25, "kal"),
(26, "deep"),
(27, "satya"),
(30, "manju")

INSERT INTO b1 values 
(10, 1.00),
(20, -1.00),
(25, 1.00),
(26, -1.00),
(27, 1.00),
(28, -1.00),
(20, -1.00),
(26, -1.00),
(28, -1.00),
(10, 2.00)

Answer 1

After creating the tables a1 and b1 and loading data in it, follow the below steps,

1) We will create a new table as below,

create table b2
(
id int,
charge float
)
stored as textfile;

2) Load data in this table,

insert into table b2 select id, charge from b1 group by id, charge having charge > 0;

3) Display the desired result,

select a.name, b.id, b.charge from a1 a join b2 b on (a.id = b.id);