Categories, subcategories and items in one query

Question

Hi,
I have this situation.
I have a category table, a subcategory table and an item
table. The structure is like below:
Category
id_cat..........catname
1...................cat1
2...................cat2
3...................cat3
4...................cat4
Subcategory
id_subcat.......subcatname.......id_cat
1...................subcat1....................1
2...................subcat2....................1
3...................subcat3....................2
4...................subcat4....................3
Items
id_item..........itemname.........id_subcat.......id_cat
1.....................item1.................1.........................1
2.....................item2.................1.........................1
3.....................item3.................2.........................1
4.....................item4.................0.........................2
5.....................item5.................0.........................2
*0 from "id_subcat" in Items table means that the item will
belong directly to the category (and the category won't have
subcategories)
I want to display them like this:
Cat1
...subcat1
.........item1
.........item2
...subcat2
..........item3
...subcat3
Cat2
..........item4
..........item5
Cat3
...subcat4
Cat4
*Cat3 and Cat4 doesn't have any items in it but I still want
to display their names
How can it is possible with CF and SQL? (using SQL server)?
Thank you.

Answer 1

Well...not quite...
It seems the code doesn't work as expected.
It works as expected with the data which already put
there...but if I put new data (like adding a new
category,subcategory and items) it doesn't display as I want it.
So, it may be a problem with bith CF AND SQL...
If I add a new category (and that category won't have
subcategories and items) then it won't be displayed (if I modify
the SQL so the INNER JOIN will become also a LEFT JOIN that new
category gets displayed...but another category dissapears! (and
that category has items in it).
If I add a new subcategory to that new category it won't be
displayed (in both INNER JOIN or LEFT JOIN).
If I let the SQL as it is now (first INNER JOIN and the
second LEFT JOIN) and I add an item to a category I already have
(or subcategory) that item will be displayed in another category
than where it suppose to be (I am adding that item manually and I
check into the database to have the right IDs for categories and
subcategories).
So, I am confused...I don't know what's wrong...
Any other ideas would be helpful, thanks.