FYI:

If you fail the Introduction to Oracle9i: SQL exam, you are not required to wait 30 days to retake it. It is ONLY for this exam. Here's the text from the Oracle Certification website:

"Candidates must wait at least 30 days before retaking any failed exam, except for exam #1Z0-007 Introduction to Oracle9i: SQL. There are no exceptions to this policy."

Interesting, huh?