Best way to have subcategories?

[jmDesktop]

I have read various things on subcategories. If there is only one
subcategory for a main category it doesn't seem too bad, just another
table, but I was wondering what some of you might recommend as the
best way to created subcategories. What if a subcategory has another
subcategory? I have read about sql adjacency models, but wanted a
real world example to see if this is necessary. thanks in advance.

[Jason Lepack]

tbl_parts:
part_id - AutoNumber
part_description

tbl_bom (bill_of_material)
bom_id - Autonumber - indexed (No Duplicates)
part_id - Number - FK - PK
sub_part_id - Number - FK - PK (No relationships yet)
qty - Number

This is something I've been toying with for a while. I don't know how
to tool the relationship for the sub_part_id to the tbl_parts. The
problem is that they are two separate instances linked to the same
field. It works well I just use an extra lookup on my form when the
record saves to make sure that the subpart exists.

Cheers,
Jason Lepack

On Feb 12, 11:18 am, "jmDesktop" <[e-mail]:

I have read various things on subcategories. If there is only one
subcategory for a main category it doesn't seem too bad, just another
table, but I was wondering what some of you might recommend as the
best way to created subcategories. What if a subcategory has another
subcategory? I have read about sql adjacency models, but wanted a
real world example to see if this is necessary. thanks in advance.