-- https://docs.oracle.com/en/database/oracle/oracle-database/23/lnpls/CREATE-PACKAGE-BODY-statement.html
CREATE OR REPLACE PACKAGE BODY emp_mgmt AS 
   tot_emps NUMBER; 
   tot_depts NUMBER; 
FUNCTION hire 
   (last_name VARCHAR2, job_id VARCHAR2, 
    manager_id NUMBER, salary NUMBER, 
    commission_pct NUMBER, department_id NUMBER) 
   RETURN NUMBER IS new_empno NUMBER; 
BEGIN 
   SELECT employees_seq.NEXTVAL 
      INTO new_empno 
      FROM DUAL; 
   INSERT INTO employees 
      VALUES (new_empno, 'First', 'Last','first.example@example.com',
              '(415)555-0100',
              TO_DATE('18-JUN-2002','DD-MON-YYYY'),
              'IT_PROG',90000000,00, 100,110);
      tot_emps := tot_emps + 1; 
   RETURN(new_empno); 
END; 
FUNCTION create_dept(department_id NUMBER, location_id NUMBER) 
   RETURN NUMBER IS 
      new_deptno NUMBER; 
   BEGIN 
      SELECT departments_seq.NEXTVAL 
         INTO new_deptno 
         FROM dual; 
      INSERT INTO departments 
         VALUES (new_deptno, 'department name', 100, 1700); 
      tot_depts := tot_depts + 1; 
      RETURN(new_deptno); 
   END; 
PROCEDURE remove_emp (employee_id NUMBER) IS 
   BEGIN 
      DELETE FROM employees 
      WHERE employees.employee_id = remove_emp.employee_id; 
      tot_emps := tot_emps - 1; 
   END; 
PROCEDURE remove_dept(department_id NUMBER) IS 
   BEGIN 
      DELETE FROM departments 
      WHERE departments.department_id = remove_dept.department_id; 
      tot_depts := tot_depts - 1; 
      SELECT COUNT(*) INTO tot_emps FROM employees; 
   END; 
PROCEDURE increase_sal(employee_id NUMBER, salary_incr NUMBER) IS 
   curr_sal NUMBER; 
   BEGIN 
      SELECT salary INTO curr_sal FROM employees 
      WHERE employees.employee_id = increase_sal.employee_id; 
      IF curr_sal IS NULL 
         THEN RAISE no_sal; 
      ELSE 
         UPDATE employees 
         SET salary = salary + salary_incr 
         WHERE employee_id = employee_id; 
      END IF; 
   END; 
PROCEDURE increase_comm(employee_id NUMBER, comm_incr NUMBER) IS 
   curr_comm NUMBER; 
   BEGIN 
      SELECT commission_pct 
      INTO curr_comm 
      FROM employees 
      WHERE employees.employee_id = increase_comm.employee_id; 
      IF curr_comm IS NULL 
         THEN RAISE no_comm; 
      ELSE 
         UPDATE employees 
         SET commission_pct = commission_pct + comm_incr; 
      END IF; 
   END; 
END emp_mgmt;