sql queries for RCA .... pls help us

hello there,

how r u doing? hope u all r doing well

well i need ur help, i've tried hard to find out the answers but i failed :-(

RCE means "Renting Car Agency"

the tables are

create table Renter
(RNO varchar2(5) primary key,
RName varchar2(10),
INCOME number,
CITY varchar2(10));

insert into Renter values('R1', 'NASSER', 12000, 'PARIS');
insert into Renter values('R2', 'NASSIM', 13000, 'LONDON');
insert into Renter values('R3', 'RABIH', 12400, 'LONDON');
insert into Renter values('R4', 'AHLAM', 11500, 'PARIS');
insert into Renter values('R5', 'RIYAD', 9500, 'DUBAI');


create table Car
(CNO varchar2(5) primary key,
CName varchar2(10),
AGE number,
CITY varchar2(10));

insert into Car values('C1', 'NISSAN', 1, 'LONDON');
insert into Car values('C2', 'HONDA', 1, 'PARIS');
insert into Car values('C3', 'MAZDA', 3, 'LONDON');
insert into Car values('C4', 'MERCDES', 4, 'OSLO');
insert into Car values('C5', 'BMW', 5, 'PARIS');
insert into Car values('C6', 'TOYOTA', 1, 'LONDON');

create table Contract
(
RNO varchar2(5) not null references Renter,
CNO varchar2(5) not null references Car,
DNO varchar2(5) REFERENCES DRIVER,
AMT number);
alter table contract add constraint contrcat_pk primary key (RNO,CNO, DNO);


insert into Contract values('R1','C1','D1',40);
insert into Contract values('R1','C2','D1',30);
insert into Contract values('R1','C3','D2',20);
insert into Contract values('R1','C4','D2',30);
insert into Contract values('R1','C5','D2',40);
insert into Contract values('R1','C6','D2',50);
insert into Contract values('R2','C1','D2',10);
insert into Contract values('R2','C2','D3',10);
insert into Contract values('R3','C3','D3',10);
insert into Contract values('R4','C4','D4',20);
insert into Contract values('R4','C5','D5',10);
insert into Contract values('R4','C6','D5',10);


and the questions are:

1. get renter number for renters who rent at least one car rented by Renter R2

2. get renter names for renters who rent car no C2

3. get the age of the car that rented by renter R1

4. get renter names for renter who does not rent car C2

5. get the car name that has 2 contracts

6. get renter numbers for renter who rent at least all those car rented by renter R2

cross posting homework questions isn't cool

SQL Server Forums - RCA system...pls help me