I need help to solve the following problem

Question

EMPLOYEES with coulmns
employee_id number, first_name varchar2(50), last_name varchar2(50), salary number, deptno number, manager number, date_of_join date, date_of_birth date.
DEPARTMENT with columns
deptno number, dept_name varchar2(100),location varchar2(100);
--Proper exceptions should be handled in all procedures and functions
7. Create a package "Salary_revision" as per steps given below.
1. Write a function "Update_salary" in the package that accepts two parameters
"Employee_id" and "Sal_raise"-Number, return type should be Number.
· Function "Update_salary" should be an AUTONOMOUS TRANSACTION function.
· The function should accept the employee id and the amount of salary to be raised.
· There should be an update statement which will update the employee table for each
employee id with the current salary + salary to be raised.
After updating the employee table with the new salary , function should return the new salary back.
Q8. Write a PL/SQL block which will fetch all employee id and their salary into a pl/sql table from the employees table .
1. The Pl/sql table should have two columns to hold the employee id and salary
2. Loop through the pl/sql table (before starting the loop, a check condition should be provided to see if the pl/sql table is empty.
3. For each record in the pl/sql table loop, call the function "Update_salary" from the package "Salary_revision" created in "Question 7" .
4. Pass the values for parameter “employee_id” and “Sal_raise”.
Value for employee id should be the value fetched from pl/sql table
For parameter "sal_raise" , pass value based on the formula given below
Pass 10% of current salary if the current salary is greater than 20lakhs.
Pass 15% of salary if the current salary is greater than 15 lakhs and less than 20 lakhs.
Pass 18% of salary if current salary is greater than 10 lakhs and less than 15 lakhs.
Pass 20% of salary if current salary is less than 10 Lakhs.
5. The new salary returned should be displayed along with Employee last name and first name (use DMS_out.put_line)
Q9. Create a package Employee_lib with functions as given below.
1. Create a Function get_emp_doj_dept that will accept the employee id and return his date of join and department number, both these values should be returned together in a record type variable.
2. Create another function get_emp_doj that will accept the employee id and department number as parameter. The function should fetch only his date of join and return the same. (Appropriate return type variable should be declared).
3. Create a function get_emp_birthday that will accept department number as parameter.
The first name and last name of all the employees whose birth day falls on the
system date should be populated in a PL/SQL table. (Declare this pl/sql table in the package specification). Function “Get_emp_birthday” should return the count of employees fetched.
Q10. Create a package Employee_lib_overload functions as geiven below.
1. Create one function "get_emp_doj_bday". This function should be overloaded to handle the functionality of all 3 functions get_emp_doj_dept" , "get_emp_doj" and "get_emp_birthday" created in question #9.
* If the user calls the function "get_emp_doj_bday" with only employee id as parameter, then it should perform the same functionality of function "get_emp_doj_dept" as in question #9.
* If the user calls the function "get_emp_doj_bday" with employee id and department number as parameter, then the function should perform the same functionality of "get_emp_doj" as in question #9.
* If the user calls the function "get_emp_doj_bday" with department number as parameter then it should perform the same functionality of function "get_emp_birthday" as in question #9.

Answer 1

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