Hi, i am new to sas and handling the patients data right now, but having trouble excluding patients if i can use some of your help, i would be so grateful! here is the dataset i have ID/converted_date(yymmdd10. format)/drug_name 1/2011-01-01/A 1/2011-01-01/B 1/2011-05-01/A 2/2012-03-07/A 2/2012-06-25/A 3/2013-01-12/A 3/2013-01-12/B 4/2014-01-12/B 4/2015-06-02/B In this example i need to extract or get ID of patients #1, #3 and #2,#4 will be included in the table. the dataset i have is about 50GB, so it is really heavy!!, it would be great if the code is simple and easy. thank you!
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