difrent id in a relational DB?? how? (4 replies)

hi there... im working on a prodject of mine and i have a little problem now... and can`t thing of a proper solution...

i have a database wich hold difrend values
1.shops - with values wich shop (street name etc..)
2.customers- name of customers witch go in the shop (id,fname,lname, phone)
3.products - and the products they leave or buy ( id, nameOFproduct, price, date... etc....)

now i have connected them with ralations but i get a little problem
i want for each diferent shop the Id form 2.custers to begin from 1
if i have for example 5 custorts in shop 1 i want the id for shop 1 to be form 1 to 5 and for shop 2 if i have there 3 customers the id should be from 1 to 3

now if i have 5 customers in shop 1 i get ID form 1 to 5 and after that if i add 3 customers to shop 2 i get ID= 6,7,8

so how can i make it so that every shop hase a separate ID table for the customers?