如何联接三个表并从三个表中以及在oracle中检索选定的列？

Question

I have 3 tables. cinema, booking and customer

create table cinema
(
c_id int,
location varchar(10)
)
insert into cinema values(1,'New York');
insert into cinema values(2,'London');
insert into cinema values(3,'Paris');

create table booking
(
c_id int,
cust_id int
)

insert into booking values(1,10);
insert into booking values(2,11);
insert into booking values(3,12);
insert into booking values(3,13);
insert into booking values(2,14);

create table customer
(
cust_id int,
cust_name varchar(10)
)

insert into customer values(10,'sam');
insert into customer values(11,'adrian');
insert into customer values(12,'mark');
insert into customer values(13,'jim');
insert into customer values(14,'tom');

I want to select customer id(ie; cust_id), customer name(cust_name) and location(from cinema table) of all customer who have not booked in paris.

what i want is --

cust_id cust_name location
10      sam       New York   
11      adrian    London
14      tom       London

I tried a lot.... one of my code is ---

SELECT customer.cust_id,customer.cust_name,
cinema.location as Location FROM booking,cinema,customer
WHERE booking.c_id=cinema.c_id AND location!='Paris';

it gives me 15 result.. I cant think how to do this.. please help me with this.

Answer 1

In your code you're not joining booking to customer , which is causing your problem. I use explicit joins as opposed to implicit here. Though there is no difference , the explicit syntax is standard.

select cu.cust_id, cu.cust_name, ci.location
  from cinema ci
  join booking b
    on ci.c_id = b.c_id
  join customer cu
    on b.cust_id = cu.cust_id
 where ci.location <> 'Paris'

I'm not entirely certain about the structure of your booking table. I would expect a few more columns, for instance number of tickets, etc.

Answer 2

Your WHERE statement is not as specific as you want. You need a condition matching booking.cust_id to customer.cust_id :

WHERE booking.c_id = cinema.c_id 
AND booking.cust_id = customer.cust_id
AND location != 'Paris'

The way you are doing it now, you are geting results for all combinations of customers.

Answer 3

See the below example :

Select   
businessuser.UserName,
businessuser.EmailAddress,
businessimages.ImgName, 
featured_cart.FeaturedPlan,featured_cart.StartDate
From featured_cart
Inner Join businessimages on featured_cart.FeaturedProId = businessimages.IdBusinessImages 
Inner Join businessuser  on businessimages.UserId = businessuser.IdBusinessUser
and featured_cart.FeaturedType = "Featured Email"

3 tables are :

1. businessuser
2. businessimages
3. featured_cart

this example work properly...

Answer 4

MS SQL Server 2008:

select cust_id, cust_name, location
from customer c 
inner join booking b 
inner join location l
on c.cust_id = b.cust_id and b.c_id=l.c_id

Answer 5

Compound Join Joining Four Tables:

Used 4 Tables

1. Customers
2. Orders
3. OrderDetails
4. Products

This Example works 100% You can try this in W3schools - Inner Join 'Try yourself' SQL Editor tables are taken from the W3schools Editor.

QUERY:

Select Customers.CustomerName as Table1_Customer, Orders.EmployeeID as Table2_Employee, OrderDetails.Quantity as Table3_OrderDetails,Products.ProductName as Table4_Products 
From Customers
INNER JOIN Orders 
ON Customers.CustomerID = Orders.CustomerID
INNER JOIN OrderDetails 
ON Orders.OrderID = OrderDetails.OrderID 
INNER JOIN Products
ON OrderDetails.ProductID = Products.ProductID Order by EmployeeID;

Answer 6

hii you can use join like this:

SQL

select customer.cust_id,customer.cust_name,cinema.location from cinema,customer,booking where cinema.c_id=booking.c_id and booking.cust_id=customer.cust_id and cinema.location not like 'paris';