How To Use Existing Values in UPDATE Statements?

If a row matches the WHERE clause in a UPDATE statement, existing values in this row can be
used in expressions to provide new values in the SET clause. Existing values are represented by
columns in the expressions. The tutorial exercise below shows a good example:
UPDATE fyi_links SET id = 1000 + id, counts = id*2
WHERE id >= 250;
3 rows updated.
SELECT * FROM fyi_links WHERE id >= 250;
ID URL NOTES COUNTS CREATED
----- ------------------------ ------------ ------- ---------
1250 Retail Sales.com Wrong URL 500 07-MAY-06
1260 Recruiting.com Wrong URL 520 07-MAY-06
1270 Payroll.com Wrong URL 540 07-MAY-06