Question

Hello I am making a reservation system and I am having troubles with my table can someone help me with my problem.
I have a table customer and a table reservation.
My customer table handles all the customers personal info and the reservation handles the reservation details.

My customer table has a customer ID which is a primary key and auto increment. and
my reservation table has a reservation ID which is a primary key and auto increment.

MY PROBLEM IS… How could I connect the two?

I have a big problem on how to join them in my select statement because I dont know what values will I join.

*Note: Btw, I’m using c# winform and I seperated the add customer and add reservation details. I am also wondering if I can include the 2 insert statement in one button or add them seperately..

Answer 1

Use the SQL JOIN statement in your SELECT QUERY:

SELECT c.CustomerName, r.ReservationTime
FROM reservation r
JOIN customer c ON r.CustomerId = c.CustomerId

Edit: It sounds like you are having trouble understanding how to get a newly created CustomerId in order to include it in the Reservation table. The key here is LAST_INSERT_ID(). After your insert into Customer, get the value from LAST_INSERT_ID() – that is the newly created CustomerId. You can then use that value when you insert into Reservation. Eg:

INSERT INTO Customer (CustomerName)
VALUES ('Joe Schmoe');

INSERT INTO Reservation (ReservationTime, CustomerId)
VALUES ('2011-09-12 18:30:00', LAST_INSERT_ID());

Pardon syntax errors – SQL Server is my primary language, if you hadn’t gathered that already.