sql server 2005 - how to take unique values in sql -

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select distinct customerid, adress left join b on a.customerid=b.customerid  points > 15

so after gives me result customerids , adresses, incase customer may have 2 ids, example or has twice registered, address same.

how can take unique values adress, adress unique, if there 2 different ids have same adress sql has leave 1 value.

please help!

select adress, max(a.customerid) left join b on a.customerid=b.customerid points > 15 group adress

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