Confused about OCA developer track.

[Abbu Rahman]

hi,
I am trying to find what exams one has to take in order to be an OCA (9i), the oracle websitesays we need to take two exams

1. Exam #1Z0-007 Introduction to Oracle9i: SQL (or) Exam #1Z0-001 Introduction to Oracle: SQL and PL/SQL

2.Exam #1Z0-147 Oracle9i: Program with PL/SQL

Now if I choose #1Z0-001 and #1Z0-147, does it work ? cause PL/SQL is repeated in both exams.

and at some other place i read that for OCA we need to take
1.#1Z1-007
2.#1Z1-031

now whats the difference between #1Z0 and #1Z1 exams

plz help ,
Rafay