Sum of columns with same name in PostgreSQL

Question

I have a table with a structure like this:

op | name | amount | total |
1  |   a  |   40   |   2   | 
2  |   a  |   80   |   4   | 
5  |   b  |   30   |   5   | 
6  |   b  |   50   |   7   | 
1  |   c  |   20   |   1   | 
3  |   c  |   30   |   4   | 

I want the amount and total columns to be added according to the name column (I need the op column to keep appearing). For this example, my select would return this result:

op | name | amount | total |
1  |   a  |  120   |   6   | 
2  |   a  |  120   |   6   | 
5  |   b  |  80    |   12  | 
6  |   b  |  80    |   12  | 
1  |   c  |  50    |   5   | 
3  |   c  |  50    |   5   | 

Can I do this using PostgreSQL?

Answer 1

Create schema:

create table tab (
  op integer,
  name varchar,
  amount integer,
  total integer
);

insert into tab values 
(1,'a',40,2), 
(2,'a',80,4), 
(5,'b',30,5), 
(6,'b',50,7), 
(1,'c',20,1), 
(3,'c',30,4);

SELECTstatement:

    select t1.op, t1.name, t2.amount, t2.total 
      from tab t1
inner join  (select name,
                    sum(amount) as amount, 
                    sum(total) as total 
               from tab 
           group by name) t2
        on t1.name = t2.name

Result:

op	name	amount	total
1	a	120	6
2	a	120	6
5	b	80	12
6	b	80	12
1	c	50	5
3	c	50	5

Test it here: db<>fiddle