query for top customer

From: Oracle DBA <oradba_at_tubes.tatasteel.com>
Date: Mon, 10 Sep 2001 06:45:42 -0700
Message-ID: <F001.00387EF9.20010910053022@fatcity.com>

how to write a query to find top 3 customer based on their sales .
eg.
TABLE A

customer       sales
A100          100
A101           200
A102           105
A103            109
A104            108

RESULTS should be..
A101       200
A103        109
A104        108

Thanks in advance
Brajesh        

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Author: Oracle DBA
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