Databases Reference
In-Depth Information
FIGURE B.37
Collective common data model.
FIGURE B.38
Correlation of data.
from many different sources. This dichotomy of needs manifests itself in a way that is not seen often
in the domain for the data modeling community.
Figure B.38
shows the results of the need for both
privacy of the individual and the need for cross-correlation of lots of different kinds of data.
An anonymous identifier is one where the encrypted identity of an individual is known only at
the source level. There is the possibility of occasionally entering data into the data warehouse where
there is no individual identifier at all.
