WITH clause with FUNCTION AND PROCEDURE, where is the mistake? - sql

Question

I have table 'Studies' (with columns: student_id, name, surname, course_name, mark) and I have a task to write a PL/SQL program, where will be WITH word + FUNCTION word + PROCEDURE word.I decided to make such a program: the function will calculate the average mark for some course (input parameter) and the procedure will display information about students whose mark in this course is higher than the average. I managed to create a function that returns the average score,
create or replace FUNCTION average_mark(co_name IN VARCHAR2) RETURN REAL IS
iter NUMBER := 0;
aver NUMBER := 0;
CURSOR c1
IS
SELECT mark
FROM studies
WHERE course_name = co_name;
BEGIN
FOR student IN c1
LOOP
iter := iter + 1;
aver := aver + student.mark;
END LOOP;
RETURN ROUND((aver/iter),2);
END above_average_mark;
and procedure which displays information about a student whose mark in the course is more than a certain one, how now to connect the procedure and the function and the WITH word?
CREATE OR REPLACE PROCEDURE above(co_name IN VARCHAR2) IS
CURSOR c2
IS
SELECT *
FROM studies
WHERE course_name = co_name;
BEGIN
FOR student IN c2
LOOP
IF (student.mark > 4) THEN
DBMS_OUTPUT.PUT_LINE('name: ' || student.student_name || ', mark: ' || student.mark);
END IF;
END LOOP;
END;
i need something like this:
WITH
PROCEDURE
FUNCTION

Answer 1

I don't have your tables to illustrate it, so I'll use Scott's sample schema to calculate average salaries for departments.
As you said that you need something like WITH PROCEDURE FUNCTION, the only thing you have to do is to follow syntax.
Therefore, here you are: with factoring clause in this example contains a procedure which displays department name and average salary; function calls the procedure (and passes department number and average salary it calculated). Also, as any other function it actually returns a value.
SQL> set serveroutput on;
SQL> with
2 procedure p_deptno (par_deptno in dept.deptno%type,
3 par_avgsal in number)
4 is
5 l_dname dept.dname%type;
6 begin
7 select dname into l_dname
8 from dept
9 where deptno = par_deptno;
10 dbms_output.put_line('Average salary for department ' || l_dname ||
11 ' = ' || par_avgsal);
12 end p_deptno;
13
14 function f_avgsal (par_deptno in dept.deptno%type)
15 return number
16 is
17 l_avgsal number;
18 begin
19 select round(avg(e.sal)) into l_avgsal
20 from emp e
21 where e.deptno = par_deptno;
22
23 p_deptno (par_deptno, l_avgsal);
24
25 return l_avgsal;
26 end f_avgsal;
27 select f_avgsal (a.deptno) avg_sal
28 from dept a;
29 /
Result:
AVG_SAL
----------
2917
2175
1567
Average salary for department ACCOUNTING = 2917
Average salary for department RESEARCH = 2175
Average salary for department SALES = 1567
Average salary for department OPERATIONS =
SQL>
Now, adjust it to your tables & data.