18) Consider the following entities and their relationship.
Owner (o_no, o_name, o_city, o_ph_no)
Estate (e_no, e_type, e_city, e_price)
The Relationship between Owner and Estate is one-to-many.
Constraints: primary key, foreign key,
o_name should not be null,
e_type can be flat, bungalow or land.
Create a RDB in 3NF and write PL/SQL blocks in Oracle for the following:
1)Write a function which will count and returns number of owners who have purchase estate in the same city in which they live.
2)Write a trigger that restricts insertion or updation of estate having price less than 1 lakh. (Raise user defined exception and give appropriate message)
create or replace function fun1(wncity in varchar2, ecity in varchar2)
return number
is
total number;
begin
select count(o.o_no) into total from Owner o, Estate e
where o.o_no=e.o_no and o.o_city=wncity
and e.e_city=ecity;
return total;
end;
select fun1('pune', 'pune') from dual;
Q2) create or replace trigger t1
before insert on Estate
for each row
begin
if(:new.e_price<100000) then
raise_application_error(-2013,'e_price should be greater then 100000');
end if;
end;
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