> In the file "Build.sql" I saw many fields I don't understand how they
> are releated, and why we need them. 
> 
> in the department table, for example:

>   Parent int(11),  /* why this? */

This is to allow sub-departments.

>   DisplayPrecedence int(11), /* and this one? */

This allows you to put an arbitrary order to departments.
You'll see a field like this in several tables.

In the item table:
>   Keywords blob, /* this one ?*/

This allows you to set up keywords to search on
for an item.  This allows you to put in a list
of words to match for an item without contriving
to put them into the description.




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