19) Consider the following entities and their relationship.
Bus(bus_no, capacity, source, destination)
Driver(driver_no, driver_name, license_no, addr, age, salary)
Relationship between Bus and Driver is many-to-many with descriptive attribute date_of_duty_allotted and shift
Constraints: primary key, foreign key,
primary key for third table (bus_no, driver_no, date_of_duty_allotted),
driver_name should not be null,
shift can be morning or evening.
Create a RDB in 3NF and write PL/SQL blocks in Oracle for the following:
Write a procedure which will display bus_no and name of allotted driver on given date and shift.
Write a trigger that restricts insertion or updation of driver table if driver age is less than 18 or greater than 50. (Raise user defined exception and give appropriate message).
create or replace procedure info_disp(dt date,sft B_D.shift%type)
is
cursor c1 is select B_D.bus_no,d_name from Bus,Driver1,B_D
where Bus.bus_no=B_D.bus_no and Driver1.driver_no=B_D.driver_no
and date_of_alloted=dt and shift=sft;
rec c1%rowtype;
begin
dbms_output.put_line(dt||' '||sft);
open c1;
loop
fetch c1 into rec;
exit when c1%notfound;
dbms_output.put_line(rec.bus_no||' '||rec.d_name);
end loop;
close c1;
end;
declare
date_of_duty date:='&date_of_duty';
duty_shift B_D.shift%type:='&duty_shift';
begin
info_disp(date_of_duty,duty_shift);
end;
Q2)
create or replace trigger t13
before insert or update on Driver1
for each row
begin
if(:new.age<18)then
raise_application_error(-2013,'the age is less than 18 ');
elsif(:new.age>50)then
raise_application_error(-2013,'the age is greater than 50.');
end if;
end;
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