Question

I have 2 tables books, mobiles in a Mysql database.

Tables structure being,

1. book_id|book_name  
2. mobile_id|mobile_name

A third table products with the following structure is also created,

1. product_id|product_name

Now, I want the book_id to start with a pattern in mysql.

For example,

book_ids -> 11,12,13,14,15,16,17,18,19,110,111,112,...  
mobile_ids -> 21,22,23,24,25,26,27,28,29,210,211,212,...

Now, in my products table I can have,

product_id -> 11,21,16,26, if this starts with pattern is not set,
then the problem would be,

product_id -> 1,1,6,6..its not unique.

How to handle this..?

Edited stuff below:

So, are you meaning this..?

category_table

category_id | category_name

1 | books
2 | mobiles

book_table

book_id | book_name

1 | da vinci code
2 | alchemist

mobile_table

mobile_id | mobile_name

1 | nokia
2 | samsung

product_table

id | product_name | product_id | category_id

1 | da vinci code | 1 | 1
2 | alchemist | 2 | 1
3 | nokia | 1 | 2
4 | samsuing | 2 | 2

Answer 1

You seem to be duplicating information without a reason.

Just create a products table with:

id | name | type (e.g. 0 book, 1 mobile, etc) | price | ....