From 1/9/2011 to 8/29/2012, how many German patients have their outpatient encounters?
From 1/9/2011 to 8/29/2012 refers to encounters.DATE between '2011-09-01' and '2012-08-29'; German patients refers to ethnicity = 'german'; outpatient encounters refers to encounters.DESCRIPTION = 'Outpatient Encounter';
SELECT COUNT(DISTINCT T1.patient) FROM patients AS T1 INNER JOIN encounters AS T2 ON T1.patient = T2.PATIENT WHERE T1.ethnicity = 'german' AND T2.DATE BETWEEN '2011-01-09' AND '2012-08-29' AND T2.DESCRIPTION = 'Outpatient Encounter'