PL/SQL block to Display

PL/SQL block to Display

00:58 0 Comments A+ a-

                 Write a PLSQL block to display following
        
    1
  1 2
  1 2 3
  1 2 3 4

Program: 

declare
str varchar2(10):='12345';
begin
for i in 1..4
loop
dbms_output.put_line(substr(str,1,i));
end loop;
end;

/

Output:
           1
1 2
1 2 3
1 2 3 4
Unknown

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