29) Consider the following entities and their relationship.
Company (c_no, c_name, c_city, c_share_value)
Person (p_no, p_name, p_city, p_ph_no)
Relationship between Company and Person is many-to-many with descriptive attribute no_of_shares.
Constraints: primary key, foreign key,
c_name and p_name should not be null,
no_of_shares should be greater than zero.
Create a RDB in 3NF and write PL/SQL blocks in Oracle for the following:
Write a procedure which will display names of person who are shareholder of the given company.
Write a trigger which get activated when share value of company become less than Rs. 10. (Raise user defined exception and give appropriate message)
Q1)
create or replace procedure p1
as
cursor c1 is select c_name from Company;
cursor c2(cname in Company.c_name%type) is select distinct p_name from Company c,Person p,CO_P cp
where c.c_no=cp.c_no and p.p_no=cp.p_no and c_name=cname;
r1 c1%rowtype;
r2 c2%rowtype;
begin
open c1;
loop
fetch c1 into r1;
exit when c1%notfound;
dbms_output.put_line(r1.c_name);
open c2(r1.c_name);
loop
fetch c2 into r2;
exit when c2%notfound;
dbms_output.put_line(r2.p_name);
end loop;
close c2;
end loop;
close c1;
end;
declare
begin
p1;
end;
Q2)
create or replace trigger t10
before insert or update on Company
for each row
begin
if (:new.c_share_value<10) then
raise_application_error(-2010,'share of value should be greater than 10');
end if;
end;
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