Question

I have a table that contain products with their specifications.i created a sample of data in http://sqlfiddle.com/#!2/15575/1 .I want create search form that users can search products by their specifications.for example user search laptop with RAM=2 and VGA=512 or VGA=1.
I wrote a query,but not working.please help me.
this example:
result: 1525,1535,k5,k6

Answer 1

select product 
from my_table  
where (custom = 'Ram' and custom_value = '2') 
    or (custom = 'vga' and custom_value in ('1', '512'))
group by product
having count(distinct custom) = 2

Example:

http://sqlfiddle.com/#!2/15575/19