duplicates query oracle

Hi - pretty new to SQL, but I have a table with an ID column with is apparently unique, i.e. there should be no more than 1 ID per " cost centre". The field of interest is called "code_combination_ID" in a table called apps.gl_code_combinations. Is there a query that can be run to ensure there is only 1 row of data per "code_combination_ID" or check for where there is more than 1 row of data per code_combination_ID?
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pma111Asked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
to find the values as such:
select code_combination_ID, count(*)
  from yourtable
group by code_combination_ID
having count(*) > 1

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for getting more data from the columns, this article may help also:
http://www.experts-exchange.com/Database/Miscellaneous/A_3203-DISTINCT-vs-GROUP-BY-and-why-does-it-not-work-for-my-query.html
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
once you have removed eventually any "duplicates", you could add a UNIQUE INDEX on the fields to ensure it will stay unique indeed.
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PortletPaulfreelancerCommented:
Hi, yes in SQL you can count rows "per something" by using a GROUP BY clause.
In addition, there is a HAVING clause which permits filtering on the calculated values of each "group by"
Like this:

select
     code_combination_ID
   , count(*) as row_count
from your_table
having count(*) > 1

This will list any "code_combination_ID" in that table that is referenced on more that 1 row.
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