>database normalization</b> which basically states that
we should never put the same string data in the database more than once. 
If we need the data more than once, we create a 
numeric <b>key</b> for the data and reference the actual data 
using this key.<br />
<br />
In practical terms, a string takes up a lot more 
space than an integer on the disk
and in the memory of our computer and takes more processor time
to compare and sort. If we only have a few hundred entries 
the storage and processor time ha