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Date:         Mon, 1 May 2000 17:04:07 -0400
Reply-To:     "Roberson, Sheryll" <RobersonS@AETNA.COM>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "Roberson, Sheryll" <RobersonS@AETNA.COM>
Subject:      Re: Get duplicate records?

Another solution is:

Data MyData; set MyData; id_class = compress(id||class);

proc sort data=MyData; by id_class;

Data MyData2; Set MyData; By id_class; If not(first.id_class) or not(last.id_class) then output;

Sheryll Roberson U.S. Quality Algorithms-Houston Strategic Healthcare Analysis

> * 713-350-2874 > *

-----Original Message----- From: David L. Ward [mailto:dward@SASHELP.COM] Sent: Monday, May 01, 2000 3:48 PM To: SAS-L@LISTSERV.UGA.EDU Subject: Re: Get duplicate records?

Here's the simplest way in my humble opinion (aka IMHO)

proc sort data=MyData; by id class; data MyData2; set MyData; by id class; if first.class+last.class<2; run;

Unique records have first.class and last.class equal to 1, all non-unique records have something else (like first.class=0, last.class=1, or both zero, etc.). So testing if the first and last indicator variables sum to 2 gives you non-unique records by class.

HTH David Ward (soon to be

-----Original Message----- From: Kathy White <kathyzhi@HOTMAIL.COM> Sent: 5/1/00 7:03:20 PM Subject: Get duplicate records?

> Suppose I have following dataset: MyData: > >ID Class grade >001 100 A >001 200 B >001 300 A >002 100 A >002 100 B >002 200 C >003 100 A >003 200 B >003 300 A > >Right now, what I want to select is those who attened the same class twice. >In this example, I want to get the student with ID=002. What is the most >efficient way to do this? Any advice is appreciated in advance. >Regards, >Kathy > > >________________________________________________________________________ >Get Your Private, Free E-mail from MSN Hotmail at >

_____________________________________________________ Sent by user David L. Ward - On-Line SAS Resources Web interface to SAS-L at

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