ALTER TABLE Servisiranje 		ADD CONSTRAINT FK_Servisiranje_Serviser 			FOREIGN KEY (ServiserID)	 	REFERENCES Serviser(ServiserID)
ALTER TABLE Servisiranje 		ADD CONSTRAINT FK_Servisiranje_Uredjaj 				FOREIGN KEY (UredjajID)  		REFERENCES Uredjaj(UredjajID)
ALTER TABLE Servisiranje 		ADD CONSTRAINT PK_Servisiranje 						PRIMARY KEY (ServiserID, UredjajID)

ALTER TABLE Racun 				ADD CONSTRAINT PK_Racun 							PRIMARY KEY (RacunID)
ALTER TABLE Racun 		ADD CONSTRAINT FK_Racun_Serviser 			FOREIGN KEY (ServiserID)	 	REFERENCES Servisiranje(ServiserID)
ALTER TABLE Racun 		ADD CONSTRAINT FK_Racun_Uredjaj 				FOREIGN KEY (UredjajID)  		REFERENCES Servisiranje(UredjajID)