Database Reference
In-Depth Information
Figure 11.6. Current settings for the Logical Elements category of the C
UST
C
OUNTY
field
You should move on to the next step if you receive an answer such as this:
“Well, the boss wants to begin tracking our customers by county,
so we must make certain we record a county for every customer.
Infact,we'vejustaddedPierceCountyandSnohomishCountyto
our sales region, so it'll be
imperative
that the county names get
recorded.”
This response clearly is a yes, soyouwill goonto define business rules forthis field in the
next step.
Step 3: Define the Necessary Business Rules for the Field
YoudefinetheappropriatebusinessrulesfortheC
UST
C
OUNTY
fieldbyidentifyingthecon-
straints implied by the response in Step 2. Then you transform each constraint into a rule.
