Oracle Certification : Help needed

Hi friends !
I want to prepare for Oracle certification. But I am in dilemma as there are two versions of Oracle : 9i and 10g for which the certification exams exists.
10g is the latest one and I think it will be better to prepare for it. But in my project we are using 9i and I wud b able to do all the practice on it.
Moreover 10g has only one paper for OCA whereas for 9i I need to clear 2 exams for OCA.
Can anybody tell me the differences between the two ?
And will all 10g commands necessary for certification run on 9i platform ?
Plz suggest which one should I go for !!

If you just want the OCP title then do 10G. If you want to be a better DBA, do the 9i OCP and then upgrade to 10G. I am 10G OCP and I could clearly see that the level of detail of the 9i study material is far superior to that of the 10G study material.
For 10G OCP they seem to assume that the database will tune itself and that you can backup and recover your database but clicking around in Enterprise Manager. This is all good in theory but if those tools fail then you still need to know what to do to get your database working.

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    HI ,
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    Manu

    I am just a beginner, but I can answer this question.
    Start here:
    http://www.oracle.com/education/certification/index.html?starthere.html
    You should be able to find an OCP candidate guide that is very
    helpful. When using the Oracle web site, getting the
    information you need (as opposed to the advertising that Oracle
    wants to feed you) is very difficult. Be patient. You might
    find more help on some of the other forums.
    The fact that your question has not been answered in over
    a month is sad. Apparently the Oracle community is afraid
    of new competition.

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    Edited by: nizamuddin mohammed on Jun 11, 2010 5:07 PM

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    if you need to have the sum of invoice related to each customer then may also need to check for the
    CUBE
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    and example here
    http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_10002.htm#i2066443
    and ROLLUP
    http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/statements_10002.htm#sthref9445
    I couldn't follow with all your SQL statement, or I could rewrite it for you again
    Thanks
    Edited by: user9532576 on Jul 21, 2009 9:24 AM

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