Using SQL, how do I update rows, using their own values?

Question

I have the following table which I'll call 'example'

id name       last_name
01 Adam       Adams
02 Bill       Billo
03 Cathy      McCathyson

I need to modify the table and end up with the following:

id name
01 Adam Adams
02 Bill Billo
03 Cathy McCathyson

For a single row, I know how to write this query:

UPDATE example SET name = 
   (SELECT name FROM example WHERE id = 01)+" "
   +(SELECT last_name FROM example WHERE id = 01)
WHERE id = 01;

How do I modify this query such that it updates each row with that row's values, as in the example?

EDIT: I've updated my example since it confused the issue.

Answer 1

UPDATE example SET NAME = NAME + ' ' + last_name

---

    ID NAME      LAST_NAME

---

     1 Adam       Adams
     2 Bill       Billo
     3 Cathy      McCathyson

SQL> UPDATE example SET NAME = NAME + ' ' + last_name
  2  /

3 rows updated

SQL> select * from example
  2  /

        ID NAME                    LAST_NAME
---------- -----------------------------------------
         1 Adam Adams              Adams
         2 Bill Billo              Billo
         3 Cathy McCathyson        McCathyson