mySQL UPDATE query returns “0 rows affected”

Question

I have this query:

UPDATE phonecalls 
   SET Called = \"Yes\" 
 WHERE PhoneNumber = \"999 29-4655\"

My table is phonecalls, I

Answer 1

Check to make sure this returns some result.

SELECT * FROM phonecalls WHERE PhoneNumber = '999 29-4655'

If it doesn't return any result than the filter WHERE PhoneNumber = '999 29-4655' is not correct.