CREATE TABLE doctor (
    doctor_id      NUMBER(4) NOT NULL,
    doctor_title   VARCHAR2(2) NOT NULL,
    doctor_fname   VARCHAR2(50),
    doctor_lname   VARCHAR2(50),
    doctor_phone   CHAR(10) NOT NULL
);
ALTER TABLE doctor ADD CONSTRAINT doctor_pk PRIMARY KEY ( doctor_id );

CREATE TABLE procedure (
    proc_code          NUMBER(5) NOT NULL,
    proc_name          VARCHAR2(100) NOT NULL,
    proc_description   VARCHAR2(300) NOT NULL,
    proc_time          NUMBER(3) NOT NULL,
    proc_std_cost      NUMBER(7, 2) NOT NULL
);

ALTER TABLE procedure ADD CONSTRAINT procedure_pk PRIMARY KEY ( proc_code );

ALTER TABLE procedure ADD CONSTRAINT proc_name_unq UNIQUE ( proc_name );

CREATE TABLE admission (
    adm_no          NUMBER(6) NOT NULL,
    adm_date_time   DATE NOT NULL,
    adm_discharge   DATE,
    patient_id      NUMBER(6) NOT NULL,
    doctor_id       NUMBER(4) NOT NULL
);

ALTER TABLE admission ADD CONSTRAINT admission_pk PRIMARY KEY ( adm_no );    --surrogate key

ALTER TABLE admission ADD CONSTRAINT admission_nk UNIQUE ( patient_id,
                                                           adm_date_time );

CREATE TABLE adm_prc (
    adprc_no           NUMBER(7) NOT NULL,
    adprc_date_time    DATE NOT NULL,
    adprc_pat_cost     NUMBER(7, 2) NOT NULL,
    adprc_items_cost   NUMBER(6, 2) NOT NULL,
    adm_no             NUMBER(6) NOT NULL,
    proc_code          NUMBER(5) NOT NULL,
    request_dr_id      NUMBER(4) NOT NULL,
    perform_dr_id      NUMBER(4)
);
ALTER TABLE adm_prc ADD CONSTRAINT adm_prc_pk PRIMARY KEY ( adprc_no );    --surrogate key
ALTER TABLE adm_prc ADD CONSTRAINT adm_prc_nk UNIQUE ( adprc_date_time,
                                                       adm_no );
ALTER TABLE adm_prc
    ADD CONSTRAINT admission_admprc FOREIGN KEY ( adm_no )
        REFERENCES admission ( adm_no );
ALTER TABLE adm_prc
    ADD CONSTRAINT doctor_performadmprc FOREIGN KEY ( perform_dr_id )
        REFERENCES doctor ( doctor_id );
ALTER TABLE adm_prc
    ADD CONSTRAINT doctor_requestadmprc FOREIGN KEY ( request_dr_id )
        REFERENCES doctor ( doctor_id );

CREATE TABLE item_treatment (
    adprc_no             NUMBER(7) NOT NULL,
    item_code            CHAR(5) NOT NULL,
    it_qty_used          NUMBER(2) NOT NULL,
    it_item_total_cost   NUMBER(8, 2) NOT NULL
);

ALTER TABLE item_treatment
    ADD CONSTRAINT item_treatment_pk PRIMARY KEY ( adprc_no,item_code);
ALTER TABLE item_treatment
    ADD CONSTRAINT admprc_itemtreatment FOREIGN KEY ( adprc_no )
        REFERENCES adm_prc ( adprc_no );
ALTER TABLE item_treatment
    ADD CONSTRAINT admprc_itemtreatment FOREIGN KEY ( adprc_no )
        REFERENCES adm_prc ( adprc_no );
ALTER TABLE item_treatment
    ADD CONSTRAINT item_itemtreatment FOREIGN KEY ( item_code )
        REFERENCES item ( item_code );

ALTER TABLE ADM_PRC ADD ANCILLARY_DR_ID NUMBER(4);
ALTER TABLE ADM_PRC
    ADD CONSTRAINT DOCTOR_PERFORM_ANCILLARY FOREIGN KEY ( ANCILLARY_DR_ID )
        REFERENCES DOCTOR ( DOCTOR_ID );

adprc_no  adprc_date_time  adprc_pat_cost  adprc_items_cost  adm_no  proc_code
 request_dr_id  perform_dr_id  ancillary_dr_id
-----------------------------------------------------------------------------------------------------------------------------
1         14/03/2019       100             100               1234    1234
 10             10             12
1         14/03/2019       100             100               1234    1234
 10             10             13