17) Consider the following entities and their relationship.
Student (s_reg_no, s_name, s_class)
Competition (comp_no, comp_name, comp_type)
Relationship between Student and Competition is many-to-many with descriptive attribute rank and year.
Constraints: primary key, foreign key,
primary key for third table(s_reg_no, comp_no, year)
s_name and comp_name should not be null,
comp_type can be sports or academic.
Create a RDB in 3NF and write PL/SQL blocks in Oracle for the following:
1)Write a procedure which will accept year and type of competition as an input and display details of competition accordingly.
2)Write a trigger that restricts insertion of rank value greater than 3. (Raise user defined exception and give appropriate message)
create or replace procedure xyz(comptype in varchar2, yr in number)
as
cursor c1 is select comp_name,comp_no from Competition c where c.comp_type=comptype;
cursor c2 is select c.comp_no from Competition c, stud_comp sc
where c.comp_no=sc.comp_no
and year=yr;
c c1%rowtype;
d c2%rowtype;
begin
open c1;
loop
fetch c1 into c;
exit when c1%notfound;
end loop;
open c2;
loop
fetch c2 into d;
exit when c2%notfound;
dbms_output.put_line('comp type'||c.comp_no);
dbms_output.put_line('comp name'||c.comp_name);
end loop;
end;
Q2)
create or replace trigger t12
before insert or update on stud_comp
for each row
begin
if(:new.rank>3) then
raise_application_error(-2013,'the Rank value should be less 3');
end if;
end;
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