SQL column name same as PL/SQL variable name - How can this be done in a select statement?

Question

Suppose I have a table:

create table foo (
  col_1     number;
  col_2     number;
);

Then I have the following code

declar         


        

Answer 1

For future reference and carrying one from @user272735 answer - the following also works

create table foo (a number, b number);

insert into foo values(1, 10);
insert into foo values(2, 20);
insert into foo values(3, 30);
/

create procedure bar
as
  a number;
  b number;
begin
  a := 2;
  select b into bar.b from foo where a = bar.a;
  dbms_output.put_line(b);
end;
/