1. **hospital** Table
Attributes:
	`hospital_id` (Primary Key)
	`hospital_name`
	`city`
	`postcode` (Unique)

```SQL
CREATE TABLE hospital (
	hospital_id CHAR(3) CONSTRAINT hID_pk PRIMARY KEY,
	hospital_name VARCHAR(30),
	city VARCHAR(15),
	postcode VARCHAR(8) CONSTRAINT postcode_unique UNIQUE
);
```

1. **transplant_unit** Table
Attributes:
	`unit_id` (Primary Key)
	`hospital_id` (Foreign Key referencing Hospital)
	`specialisation`

```SQL
CREATE TABLE transplant_unit (
	unit_id CHAR(4) CONSTRAINT uID_pk PRIMARY KEY,
	hospital_id CHAR(3) CONSTRAINT hID_fk FOREIGN KEY REFERENCES hospital( hospital_id ),
	specialisation VARCHAR(20)
);
```

1. **organ** Table:
Attributes:
	`organ_id` (Primary Key)
	`organ_type`

```SQL
CREATE TABLE organ (
	organ_id CHAR(3) CONSTRAINT oID_pk PRIMARY KEY,
	organ_type VARCHAR(15) 
);
```

1. **patient** Table:
Attributes:
	`patient_id` (Primary Key)
	`patient_name`
	`age`

```SQL
CREATE TABLE patient (
	patient_id CHAR(3) CONSTRAINT pID_pk PRIMARY KEY,
	patient_name VARCHAR(10),
	age INTEGER
);
```

1. **donor** Table:
Attributes:
	`donor_id` (Primary Key)
	`donor_name`
	`age`

```SQL
CREATE TABLE donor (
	donor_id CHAR(3) CONSTRAINT dID_pk PRIMARY KEY,
	donor_name VARCHAR(10),
	age INTEGER
);
```

1. **operation** Table
Attributes:
	`operation_id` (Primary Key)
	`unit_id` (Foreign Key referencing TransplantUnit)
	`organ_id` (Foreign Key referencing Organ)
	`patient_id` (Foreign Key referencing Patient)
	`donor_id` (Foreign Key referencing Donor)

```SQL
CREATE TABLE operation (
	operation_id CHAR(3),
	organ_id CHAR(3) CONSTRAINT oID_fk FOREIGN KEY REFERENCES organ( organ_id ),
	unit_id CHAR(4) CONSTRAINT uID_fk FOREIGN KEY REFERENCES transplant_unit( unit_id ),
	patient_id CHAR(3) CONSTRAINT pID_fk FOREIGN KEY REFERENCES patient( patient_id ),
	donor_id CHAR(3) CONSTRAINT dID_fk FOREIGN KEY REFERENCES donor( donor_id ),
	CONSTRAINT comp_op_key PRIMARY KEY ( operation_id, organ_id )
);
```