January 2003
Intermediate to advanced
300 pages
15h 18m
English
Content preview from Data Quality
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| 9 ~ C H A P T E B.
9 Structure Analysis
source for conformance to dependencies found in discovery when discovery
only used a sample of the data. The purpose here is to find out how close they
were to being true.
You do not need to test functional dependencies based on a single column
defined to a database system as a primary key or that have a UNIQUE con-
straint if the database system enforces uniqueness. Likewise, if you have deter-
mined that the cardinality of the column is the same as the number of rows in
the table, you are certain that it is a true key. No further testing is required.
The process of testing ...
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