How to make a Crosstab query

From: <sohelcse_at_citechco.net>
Date: Tue, 12 Dec 2000 18:41:54 GMT
Message-ID: <915rhg$rac$1@nnrp1.deja.com>

I have a query output like this :
Client Month Year Sales
------ ------ ---- -----

ABC         JAN    1999     $10,000
ABC         FEB    1999     $5,000
XYZ         JAN    1999     $20,000
XYZ         FEB    1999     $99,000

.
.
.

other months...

How can I make the following type of output in Oracle:

Client    Jan     Feb
------    ---     ---
ABC      10,000   5,000
XYZ      20,000   99,000

.
.

other clients...

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