January 2003
Intermediate to advanced
300 pages
15h 18m
English
Content preview from Data Quality
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9.2 Understanding the Structures Being Profiled I ~7
ers in the same city that have a large number of orders. To make that query
work, the representation of city values must be consistent across the CITY
column pairs.
Domain synonyms exist across the foreign key columns of multiple pri-
mary key/foreign key synonyms that share the same primary key column. For
example, as shown in the first part of Figure 9.5, the two columns for
DEPT_MGR and PROJECT_MEMBER are domain synonyms. They repre-
sent the same business fact (an employee) but have no structural meaning.
These types of synonyms ...
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