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st: Keep first observation in such a dataset?

From   "Peter Miller" <>
Subject   st: Keep first observation in such a dataset?
Date   Tue, 11 Feb 2014 22:39:04 +0100 (CET)

Hi guys,

this is my dataset:

DATE      ID1         ID2    EVENT_DATE
8/13/2007 10147      95574   13aug2007
8/14/2007 10147              13aug2007
8/15/2007 10147              13aug2007
8/16/2007 10147              13aug2007
8/17/2007 10147      75645   13aug2007
8/20/2007 10147              13aug2007
.....             ......
I want to keep only the first ID2. In the example, I want to keep 95574 only. Only the one, which is between DATE and EVENT_DATE. I want to drop all following ID2s in the time series. There are many different ID1s, but each ID1 belongs to only one single ID2, namely the one where EVENT_DATE==DATE. 
How can I code this?

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