Is there a way to find TOP X records with grouped data?

Posted by Chris Simmons on Stack Overflow See other posts from Stack Overflow or by Chris Simmons
Published on 2010-06-01T22:07:23Z Indexed on 2010/06/01 22:13 UTC
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tsql

|

sybase

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greatest-n-per-group

I'm working with a Sybase 12.5 server and I have a table defined as such:

CREATE TABLE SomeTable(
[GroupID] [int] NOT NULL,
[DateStamp] [datetime] NOT NULL,
[SomeName] varchar(100),
PRIMARY KEY CLUSTERED (GroupID,DateStamp)

)

I want to be able to list, per [GroupID], only the latest X records by [DateStamp]. The kicker is X > 1, so plain old MAX() won't cut it. I'm assuming there's a wonderfully nasty way to do this with cursors and what-not, but I'm wondering if there is a simpler way without that stuff.

I know I'm missing something blatantly obvious and I'm gonna kick myself for not getting it, but .... I'm not getting it. Please help.

Is there a way to find TOP X records, but with grouped data?

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