I have a problem with triggers i sql Oracle - sql

Question

(zaposlenik means emplpoyee, godisnji_odmor means vacation)
So I want to make a trigger that triggers if an employee(here is called zaposlenik) has more than 21 days of vacation after an insert in year 2020. An employee can have multiple vacations(like 2 days, 10 days...) one to many relation between tables zaposlenik(employee) and godisnji_odmor(vacation). My problem here is that I don't know how to get that zaposlenik_id from the insert on which the trigger tiggers so I can sum up the vacation days of that employee on the ID = zaposlenik_id.
Here are my tables and trigger.
CREATE TABLE zaposlenik
(
zaposlenik_id INTEGER CONSTRAINT zaposlenik_pk PRIMARY KEY,
posao VARCHAR(30) NOT NULL,
ime VARCHAR(30) NOT NULL,
prezime VARCHAR(30) NOT NULL,
broj_tel INTEGER NOT NULL,
email VARCHAR(50) NOT NULL,
adresa VARCHAR(100) NOT NULL,
mjesecni_iznos_place FLOAT NOT NULL,
IBAN VARCHAR(34) NOT NULL,
budzet FLOAT,
parking_mjesto_id VARCHAR(5) CONSTRAINT zaposlenik_parking_mjesto_fk REFERENCES
parking_mjesto(etaza_i_br_mjesta),
zaposlenik_id_2 INTEGER CONSTRAINT zaposlenik_zaposlenik_fk REFERENCES
zaposlenik(zaposlenik_id)
);
CREATE TABLE godisnji_odmor
(
godisnji_odmor_id INTEGER CONSTRAINT godisnji_odmor_pk PRIMARY KEY,
pocetak DATE NOT NULL,
kraj DATE NOT NULL,
zaposlenik_id INTEGER NOT NULL CONSTRAINT godisnji_odmor_zaposlenik_fk REFERENCES
zaposlenik(zaposlenik_id)
);
CREATE OR REPLACE TRIGGER t_godisnji
AFTER INSERT
ON godisnji_odmor
DECLARE
v_br NUMBER; --sum of the vacation days
v_id NUMBER; -- id of the employee that is inserted (his id is zaposlenik_id)
BEGIN
SELECT zaposlenik_id INTO v_id FROM INSERTED;
SELECT SUM( g.kraj - g.pocetak ) INTO v_br
FROM zaposlenik z INNER JOIN godisnji_odmor g USING(zaposlenik_id)
WHERE g.pocetak > '01-JANUARY-2020' AND zaposlenik_id = v_id;
IF v_br > 21 THEN
ROLLBACK;
raise_application_error(-20100,'Godisnji prekoracuje 21 dan u sumi');
END IF;
END t_godisnji;
/

Answer 1

You need to use the :new for this as follows:
replace
SELECT zaposlenik_id INTO v_id FROM INSERTED;
with
v_id := :new.zaposlenik_id;
In short, You can have your code without v_id variable as follows:
CREATE OR REPLACE TRIGGER t_godisnji
AFTER INSERT
ON godisnji_odmor
DECLARE
v_br NUMBER; --sum of the vacation days
--v_id NUMBER; -- id of the employee that is inserted (his id is zaposlenik_id)
BEGIN
--SELECT zaposlenik_id INTO v_id FROM INSERTED;
SELECT SUM( g.kraj - g.pocetak ) INTO v_br
FROM zaposlenik z INNER JOIN godisnji_odmor g USING(zaposlenik_id)
WHERE g.pocetak > '01-JANUARY-2020'
AND zaposlenik_id = :new.zaposlenik_id; -- see the usage of :new here
IF v_br > 21 THEN
ROLLBACK;
raise_application_error(-20100,'Godisnji prekoracuje 21 dan u sumi');
END IF;
END t_godisnji;
/