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Building the Unstructured Data Warehouse: Architecture, Analysis, and Design by Krish Krishnan, W. H. Inmon

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Another important index type is the patterned index. A patterned index is created when a common pattern is found and recognized. On occasion, the type of word is recognized merely by looking at its format. Some simple examples are:

·         (American) telephone number – 999-999-9999

·         Email address – xxxx@yyyy.com

·         Social security number – 999-99-9999

When the pattern is recognized, the index value and the type of pattern are created in the index table. Figure 7.9 shows a patterned index.

Figure 7.9 Patterned index

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