-- Modify "InternalReference" table
ALTER TABLE "public"."InternalReference" ADD COLUMN "SrcDoctor_Code" character varying(20) NULL, ADD COLUMN "SrcNurse_Code" character varying(20) NULL, ADD COLUMN "Nurse_Code" character varying(20) NULL, ADD CONSTRAINT "fk_InternalReference_Nurse" FOREIGN KEY ("Nurse_Code") REFERENCES "public"."Nurse" ("Code") ON UPDATE NO ACTION ON DELETE NO ACTION, ADD CONSTRAINT "fk_InternalReference_SrcDoctor" FOREIGN KEY ("SrcDoctor_Code") REFERENCES "public"."Doctor" ("Code") ON UPDATE NO ACTION ON DELETE NO ACTION, ADD CONSTRAINT "fk_InternalReference_SrcNurse" FOREIGN KEY ("SrcNurse_Code") REFERENCES "public"."Nurse" ("Code") ON UPDATE NO ACTION ON DELETE NO ACTION;