What is the best link structure for SEO ?

www.example.com/post_id/category/postname.html

or

www.example.com/category/postname.html / www.example.com/category/post_id/postname.html

when using post id as first.. the pages will be created like this

http://www.example.com/25850/books/maths/book-name.html
http://www.example.com/43540/books/maths/book-name.html
http://www.example.com/25562/books/maths/book-name.html

other ways it will be looking like this
http://www.example.com/books/maths/book-name.html
or
http://www.example.com/books-book-name.html

will google respect the URL more if it have less slashes ?

Thanks.

 

Yes i will prefer to have least possible slashes when preparing my site for SEO.
http://www.example.com/books-book-name.html is my one favorite URL structure to go and also use the same for my Wordpress site posts.

 

http://www.example.com/books-book-name.html is best option. you can use your keywords in URL as well.

 

I Think www.example.com/category/postname.html is more Appropriate URL..

 

Thanks for the replies I prefer the www.example.com/category/postname.html too

 

According me this is the best url structure - www.example.com/bookname.html or www.example.com/book-name.html

 

The first response by @tharshan pretty much sums it all up

 

IMO http://www.example.com/books/maths/book-name.html is good.

 

I am also agree with second one structure