ID_section INTEGER NOT NULL,
Section_Category INTEGER NULL,
Section_Resource VARCHAR(20) NULL,
Section_Building VARCHAR(20) NULL,
Section_Permitted VARCHAR(20) NULL
);
ALTER TABLE Section
ADD PRIMARY KEY (ID_section);
ALTER TABLE Client
ADD FOREIGN KEY R_25 (ID_rent_contract) REFERENCES Rent (ID_rent_contract);
ALTER TABLE Client
ADD FOREIGN KEY R_26 (ID_sale_contract) REFERENCES Sale (ID_sale_contract);
ALTER TABLE Individual
ADD FOREIGN KEY R_29 (ID_client) REFERENCES Client (ID_client);
ALTER TABLE Juridical
ADD FOREIGN KEY R_28 (ID_client) REFERENCES Client (ID_client);
ALTER TABLE Rent
ADD FOREIGN KEY R_23 (ID_section) REFERENCES Section (ID_section);
ALTER TABLE Sale
ADD FOREIGN KEY R_24 (ID_section) REFERENCES Section (ID_section);