Question: — an event management database drop table registration cascade constraint; drop table participa……

— an event management database

drop table registration cascade constraint;

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drop table participant cascade constraint;

drop table event cascade constraints;

drop table organizer cascade constraints;

drop table location cascade constraints;

create table location

(lid int, —- location id

lname varchar(50), — location name

capacity int, — capacity of the location

primary key (lid));

insert into location values (1, ‘ITE 459’, 40);

insert into location values (2, ‘UC ballroom’, 300);

insert into location values (3, ‘Event Center’,3000);

create table organizer

(oid int, — organizer id

oname varchar(50), — organizer name

oemail varchar(50), — organizer’s email

otype int, — 1 university, 2 department, 3 student

primary key(oid));

insert into organizer

values (1, ‘Dr. B’, ‘’, 2);

insert into organizer

values (2, ‘Ms. C’, ‘’, 1);

insert into organizer

values (3, ‘Ellen’, ‘’,3);

create table event

(eid int, — event id

oid int, — organizer id

ename varchar(50), — event name

lid int, — location id

start_time timestamp, — start time of event

duration interval day to second, — duration of event,

status int, — 1 scheduled, 2 canceled, 3 finished

primary key(eid),

foreign key (lid) references location,

foreign key (oid) references organizer);

insert into event values (1, 1,’Department seminar’, 1, timestamp ‘2018-9-6 10:00:00.00’,interval ‘2’ hour, 3);

insert into event values(2,2, ‘2018 Graduate Commencement’, 3,

timestamp ‘2018-12-19 10:00:00.00’, interval ‘2’ hour, 1);

insert into event values(3, 3,’Ellen dissertation defenes’, 1,

timestamp ‘2018-11-16 14:00:00.00’, interval ‘2:30′ hour to minute, 1);

insert into event values(4, 2,’Teaching Seminar’, 2,

timestamp ‘2018-11-10 12:00:00.00’, interval ‘1:30’ hour to minute, 2);

create table participant

(pid int, — participant id

pname varchar(50), — participant name

pemail varchar(50), — participant email

primary key(pid));

insert into participant values(1, ‘Jeff’, ‘’);

insert into participant values(2, ‘Grace’, ‘’);

insert into participant values(3, ‘Ethan’, ‘’);

insert into participant values(4, ‘Susan’,’’);

create table registration

(pid int, — participant id

eid int, — event id

status int, — 1 registered, 2 canceled

primary key(pid, eid),

foreign key(pid) references participant,

foreign key(eid) references event);

insert into registration values(1, 1, 1);

–insert into registration values(4, 1, 1);

insert into registration values(2, 2, 1);

insert into registration values(3, 2, 2);

insert into registration values(4, 2, 1);

insert into registration values(3, 3, 1);

insert into registration values(4, 3, 2);

insert into registration values(1,4,2);

insert into registration values(3,4,2);


Please write an anonymous PL/SQL program to print out the email of organizer of the event ‘Department seminar’ as well as start_time and end time of the event. Please use implicit cursor and handle exception. You will lose 10 points if you use an explicit cursor.

Hint: The end time of an event equals start_time + duration.

Expert Answer


create table temp(col1 integer);
insert into temp values null;
N integer not null := 0;
null_variable exception;
select col1 into N from temp;
select organizer.oname, organizer.oemail, event.ename, event.start_time, event.duration from event inner join organizer on event.oid=organizer.oid where event.ename in (‘Department seminar’);
if N is sql%rowcount then
RAISE exception;
dbms_output.put_line(‘Number of rows processed: ‘||sql%rowcount);
end if;
when null_variable then
dbms_output.put_line(‘EXCEPTION: Null detected’);

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