Can this MySQL db be improved or is it good as it is?

Question

In a classifieds website, you have several categories (cars, mc, houses etc). For every category chosen, a hidden div becomes visible and shows additional options the user m

Answer 1

Your design is very much tied to the underlying products. Also you are putting what appears to be mutually exclusive data in different columns (e.g. surely a house can't be both a villa and an aprtment?) I'd go with a much more generalized form, something like:

Category 
Classified
Poster

As in the OP, but with primary keys added/declared.

Then group all the category specific attributes into a single table - like

Std_Tags {id, category, tag}
{0,Cars,year}
{1,Cars,fuel}
{2,house,type}
{3,house,rooms}

With values in another table:

classified_tags {std_tags_id, classified_id, value}
{0,13356,2005}
{2,109,villa}
{0,153356,diesel}

This also simplifies the building of input forms becuase the template is explicitly stated also, by adding a table like:

Allowed_values {std_tags_id, value}
{1,diesel}
{1,petrol}
{1,LPG}
{2,Villa}
{2,Apartment}

Then much of the data entry could be done using drop-down lists, conforming to standard searches.

C.