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Msdn China Tech >> MS-SQL Server >> 疑难问题

有难度sql

原数据：
supplier product
-------- --------
s1 p1
s1 p2
s1 p3
s2 p1
s2 p2
s2 p4
s2 p5
s3 p1
s3 p2
s3 p6
. .
. .
. .
要结果：
product
--------
p1
p2
[270 byte] By [CoolSailor] at [2008-2-18]
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