DROP TABLE Adress;
DROP TABLE Room;
DROP TABLE Person;
DROP TABLE Clerk;
DROP TABLE Client;



CREATE TABLE Adress
(
    adressId NUMBER PRIMARY KEY,
    street VARCHAR2(50) NOT NULL,
    houseNumber NUMBER NOT NULL,
    postalCode NUMBER NOT NULL,
    city VARCHAR2(50) NOT NULL,
    country VARCHAR2(50) NOT NULL
);

CREATE TABLE Room
(
    roomNumber NUMBER PRIMARY KEY,
    floor NUMBER NOT NULL,
    roomTyp VARCHAR2(50) NOT NULL,
    size NUMBER NOT NULL,
    accessibility NUMBER NOT NULL,
    beds NUMBER NOT NULL
);

CREATE TABLE Person
(
    personId NUMBER PRIMARY KEY,
    name VARCHAR2(50) NOT NULL,
    lastName VARCHAR2(50) NOT NULL,
    age NUMBER NOT NULL,
    adressId NUMBER NOT NULL,
    CONSTRAINT fkadress FOREIGN KEY (adressId) REFERENCES Adress(adressId)
);

CREATE TABLE Clerk
(
    personId NUMBER PRIMARY KEY,
    staff NUMBER NOT NULL UNIQUE,
    salary NUMBER NOT NULL,
    CONSTRAINT inheritace FOREIGN KEY (personId) REFERENCES Person(personId)
);

CREATE TABLE Client
(
    personId NUMBER PRIMARY KEY,
    bankDetails VARCHAR2(22) NOT NULL,
    CONSTRAINT inheritace FOREIGN KEY (personId) REFERENCES Person(personId)
);