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From: ªL©[¾N <s9154083@cyut.edu.tw>
To: pgsql-sql@postgresql.org
Subject: A SQL Question About distinct, limit, group by, having, aggregate
Date: Thu, 31 Mar 2005 10:29:16 +0800
Message-ID: <20050331022422.M58459@cyut.edu.tw> (raw)

i have a little question, how to get 3 higher score student in every class.
Data looks like as below

problem:
id		class		score
john		a		100
jenny		a		70
ken		a		59
mary		b		85
jacky		b		80
lily		b		70
kevin		b		50
david		b		30
tina		c		85
tony		c		80
bare		c		70
vivian		c		60
eric		c		57
andy		c		50

result:
id		class		score
john		a		100
jenny		a		70
ken		a		59
mary		b		85
jacky		b		80
lily		b		70
tina		c		85
tony		c		80
bare		c		70

--
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