using the... multiple loop and insert

Hello

I have the following structure:
create table schoolboys(
id integer,
name varchar2(20)
);

create table marks(
id integer,
mark number(2,0),
schoolboy_id integer
constraint fk_marks foreign key(schoolboy_id) references schoolboys(id)
);

create table avg_marks (
id integer
     constraint pk_avgmarks primary key(id)
schoolboy_id,
avg_mark number(4,2)
);

insert into schoolboys values (1, 'John');
insert into schoolboys values (2, 'Mary');

insert into marks values (1, 10, 1);
insert into marks values (2, 9, 1);
insert into marks values (3, 9, 1);
insert into marks values (4, 10, 1);
insert into marks values (5, 9, 1);
insert into marks values (6, 10, 2);
insert into marks values (7, 10, 2);
insert into marks values (8, 9, 2);
I want to calculate (using a loop for (I think) the average marks of each student, then I want to insert the results of the third table... for example, after having calculated the brand. moy, the third table must contain:
1 1 9.4
1 2 9,66

Help me please if you can

Kind regards

Edited by: Roger22 the 16.06.2009 09:49 
API> INSERT INTO avg_marks
  2  SELECT ROWNUM, SEL.schoolboy_id, SEL.media
  3  FROM
  4    (SELECT schoolboy_id, AVG(mark) AS media
  5    FROM marks
  6    GROUP BY schoolboy_id) SEL;

2 filas creadas.

API> SELECT *
  2  FROM avg_marks;

        ID SCHOOLBOY_ID   AVG_MARK
---------- ------------ ----------
         1            1        9,4
         2            2       9,67

Tags: Database

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