Question

Tables

product: id, price
productattribute:id, productid, attributeid
attributes: id, value, attributetypeid
attributetype:id, name

Query

select p.Name, p.Price, att.Id, att.Value, at.Id, at.Name
from Product p
inner join ProductAttribute pa on pa.ProductId = p.Id
inner join Attributes att on att.Id = pa.AttributeId
inner join AttributeType at on att.AttributeTypeId = at.Id

Result

Name              Price    Id    Value     Id      Name
Slr camera           90     1    White      1      Color   
digital camera       98     2    Black      1      Color    
Slr camera           90     4    big        2      Size
digital camera       98     5    medium     2      Size

Now I want to retrieve products by filtering attributesid ie attributesid=1(which is white) and doing so must filter only the color attributetype not the size. What I mean is it should retrieve three rows now: rows with Color – White, Size – big and Size – medium.

Answer 1

Use a where clause to allow non-color attributes and color attributes if they’re white:

where  at.AttributeTypeId <> 1 -- Non-color attribute
       or at.AttributeTypeId = 1 and att.Id = 1 -- White color