Trigger DML in oracle database - oracle

Question

I have problem with my dml trigger on oracle database.I want to launch trigger when i update first_name or last name on employees table in hr schema. During execution trigger i Have error ORA-00060: Please help. Idon't have any ideas how can i fix it.enter image description here
CREATE OR replace TRIGGER up_sal
BEFORE UPDATE OF first_name, last_name ON employees
FOR EACH ROW
DECLARE
PRAGMA autonomous_transaction;
var_sal employees.salary%TYPE;
var_avg NUMBER;
var_emp_id NUMBER;
BEGIN
SELECT salary
INTO var_sal
FROM employees
WHERE first_name = :NEW.first_name
OR last_name = :NEW.last_name;
SELECT Avg(salary)
INTO var_avg
FROM employees
WHERE department_id IN( :OLD.department_id );
IF var_sal < var_avg THEN
var_emp_id := :OLD.employee_id;
UPDATE employees
SET salary = var_avg * 1.1
WHERE employee_id = var_emp_id;
COMMIT;
END IF;
END;

Answer 1

You can use:
CREATE TRIGGER up_sal
BEFORE UPDATE OF first_name, last_name ON employees
FOR EACH ROW
DECLARE
PRAGMA AUTONOMOUS_TRANSACTION;
var_avg employees.salary%TYPE;
BEGIN
SELECT Avg(salary)
INTO var_avg
FROM employees
WHERE department_id IN( :OLD.department_id );
IF :NEW.salary < var_avg THEN
:NEW.salary := var_avg * 1.1;
END IF;
COMMIT;
END;
/
Which, for the sample data:
CREATE TABLE employees (
department_id NUMBER,
first_name VARCHAR2(20),
last_name VARCHAR2(20),
salary NUMBER
);
INSERT INTO employees (department_id, first_name, last_name, salary)
SELECT 1, 'Alice', 'Abbot', 90 FROM DUAL UNION ALL
SELECT 1, 'Betty', 'Baron', 95 FROM DUAL UNION ALL
SELECT 1, 'Carol', 'Count', 105 FROM DUAL UNION ALL
SELECT 1, 'Debra', 'Duke', 110 FROM DUAL;
Then if you do:
UPDATE employees
SET first_name = TRIM(first_name),
last_name = TRIM(last_name);
Then:
SELECT * FROM employees;
Outputs:
DEPARTMENT_ID
FIRST_NAME
LAST_NAME
SALARY
1
Alice
Abbot
110
1
Betty
Baron
110
1
Carol
Count
105
1
Debra
Duke
110
db<>fiddle here