27) Consider the following entities and their relationship.
Donor (donor_no, donor_name, city)
Blood_donation_detail (bd_no, blood_group, qty, date_of_collection)
Relationship between Donor and Blood_donation_detail is one-to-many.
Constraints: primary key, foreign key,
donor_name should not be null,
blood_group can be A+, A-, B+, B-, AB+, AB-, O+, O-
Create a RDB in 3NF and write PL/SQL blocks in Oracle for the following:
1)Write a procedure which will display blood group wise total amount of quantity of blood available.
2)Write a trigger that restricts insertion of blood_donation_details having quantity greater than 300ml. (Raise user defined exception and give appropriate message)
create or replace procedure p3
is
cursor c1 is select blood_group,qty from Blood_donation_detail ;
begin
for a in c1 loop
dbms_output.put_line(a.blood_group||' '||a.qty);
end loop;
end;
declare
begin
p3;
end;
Q2)
create or replace trigger t22
2 before insert on blood_donation_details
3 for each row
4 begin
5 if(:new.qty<=300) then
6 raise_application_error(-20011,'qty should be enter greater than 300 ml');
7 end if;
8 end;
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