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Semester 1/Database Systems/Assignment/Scripts/Script-2.sql

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+SELECT MAX(age) as oldest_donor	
+FROM donor
+WHERE donor_id IN (
+	SELECT donor_id
+	FROM operation
+	WHERE unit_id IN (
+		SELECT unit_id
+		FROM transplant_unit
+		WHERE hospital_id IN (
+			SELECT hospital_id
+			FROM hospital
+			WHERE city LIKE '%Manchester%'
+		)
+	)
+);