21)Consider the following entities and their relationship.
Train(t_no, t_name)
Passenger (p_no, p_name, addr, age)
Relationship between Train and Passenger is many-to-many with descriptive attribute date, seat_no and amt.
Constraints : primary key, foreign key,
primary key for third table (t_no, p_no, date),
t_name and p_name should not be null,
amt should be greater than zero.
Create a RDB in 3NF and write PL/SQL blocks in Oracle for the following:
1)Write a procedure which will display passenger details of given train on ‘1 July 2014’.
2)Write a trigger that restricts insertion of train_passenger detail having date less than current date. (Raise user defined exception and give appropriate message)
Q1)
create or replace procedure p1(dt in date)
as
cursor c1 is select t.t_name,p.p_no,p_name,addr,age from Train t,Passenger p,T_P tp
where t.t_no=tp.t_no and p.p_no=tp.p_no and date1=dt;
begin
for x in c1 loop
dbms_output.put_line(x.t_name||' '||x.p_name||' '||x.addr||' '||x.age);
end loop;
end;
declare
begin
p1('01-july-2014');
end;
Q2)
create or replace trigger t15
before insert or update on T_P
for each row
begin
if(:new.date1<:new.date1) then
raise_application_error(-2013,'the current date should be greater then old date');
end if;
end;
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