How to write user-defined aggregate function

From: konghou <brotherhou_at_yahoo.com>
Date: 11 Nov 2002 22:56:30 -0800
Message-ID: <c19678a1.0211112256.ecfcb82_at_posting.google.com>

How to write an user-defined aggregate function? e.g. select my_function(sal) from emp; Received on Tue Nov 12 2002 - 07:56:30 CET

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