first commit

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%'
+		)
+	)
+);

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

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+CREATE TABLE hospital (
+	hospitalID CHAR(3) CONSTRAINT hID_pk PRIMARY KEY,
+	hospitalName VARCHAR(20),
+	city VARCHAR(15),
+	postcode CHAR(8) CONSTRAINT postcode_unique UNIQUE
+);
+CREATE TABLE transplantUnit (
+	unitID CHAR(4) CONSTRAINT uID_pk PRIMARY KEY,
+	hospitalID CHAR(3) CONSTRAINT hID_fk FOREIGN KEY REFERENCES hospital(HospitalID),
+	specialisation VARCHAR(10)
+);
+CREATE TABLE organ (
+	organID CHAR(3) CONSTRAINT oID_pk PRIMARY KEY,
+	organType VARCHAR(15) 
+);
+CREATE TABLE patient (
+	patientID CHAR(3) CONSTRAINT pID_pk PRIMARY KEY,
+	patientName VARCHAR(10),
+	age INTEGER
+);
+CREATE TABLE donor (
+	donorID CHAR(3) CONSTRAINT dID_pk PRIMARY KEY,
+	donorName VARCHAR(10),
+	age INTEGER
+);
+CREATE TABLE operation (
+	operationID CHAR(3) CONSTRAINT opID_pk PRIMARY KEY,
+	unitID CHAR(4) CONSTRAINT uID_fk FOREIGN KEY REFERENCES transplantUnit(unitID),
+	organID CHAR(3) CONSTRAINT oID_fk FOREIGN KEY REFERENCES organ(organID),
+	patientID CHAR(3) CONSTRAINT pID_fk FOREIGN KEY REFERENCES patient(patientID),
+	donorID CHAR(3) CONSTRAINT dID_fk FOREIGN KEY REFERENCES donor(donorID)
+);