barcode vb.net 2010 Conforming Attributes in Software

Maker QR Code in Software Conforming Attributes

Conforming Attributes
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The common attributes of core and custom dimensions should conform. This means they must be the same in terms of their structure and content, as you learned in 5. For the core and custom product tables in Figure 13-2, this means the columns SKU, name, publisher, and product_type must have the same names and data type definitions in each table. It also means that the content of these columns must be expressed in a consistent manner. A book called The Contrarian Pathway should have exactly the same product name in the core product table and in the custom book_product table. This conformance is illustrated in the table instance diagrams of Figure 13-3. The core attributes of the book_product table conform with those in the product table. They have the same type definitions and names, and their content is expressed identically. The highlighted rows show conforming rows for product A220022. Core attributes are expressed identically. This figure also illustrates the scope of the core and custom dimension tables. The core table, product, contains rows for all product types; the custom table book_ product contains rows only for products of type Book.
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Common Surrogate Keys
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Conformed core and custom dimensions differ from the conformed dimensions of 5 in one important respect. They share one additional element in common: the surrogate key. Looking back to Figure 13-2, for example, you will see that the product-specific custom dimensions use the same product_key values as the core dimension table. Core and custom dimension tables share a common key domain. The use of a common set of surrogate keys allows the appropriate version of the dimension table to be joined to a fact table interchangeably. For example, the highlighted product in Figure 13-3 has the same key value in both versions of the product dimension. This means that either version can be joined to a fact table for meaningful analysis. If you are studying all products, the core dimension may be joined to the fact table; if you are focusing on book products, the custom dimension may be joined to the fact table.
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Part IV
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PART IV
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Fact Table Design
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PRODUCT product_ key 100 101 102 103 104 105 sku B221101 N22911 B33921 A220022 Q27822 C770077 name Summer in New York product_ type Book
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Same attribute content Same key values
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BOOK_PRODUCT product_ key 100 103 105 sku B221101 A220022 C770077 name Summer in New York The Contrarian Pathway Havana, 3AM product_ type Book Book Book author Michael Jones John Mellor P. Gustave Simonon genre Travel Lifestyle Fiction cover_ type Paperback Paperback Hardcover
Figure 13-3 Core and custom dimensions conform
TIP The common attributes of core and custom dimensions must conform and share a common key domain. Since core and custom dimensions contain conforming attributes and share a common key domain, the core dimension can be thought of as representing a union of the common attributes of each custom dimension table. In fact, many ETL developers build them in this manner. Bear in mind that, in rare situations, it may be possible for a single item to appear in more than one custom dimension. An example of this phenomenon will be explored shortly. For the SQL-literate reader, this implies the use of UNION rather than UNION ALL.
13 Type-Specific Stars 313
Slowly Changing Dimensions
Type 2 slow changes can produce a notable side effect with core/custom designs. As you learned in 3, the type 2 response to a change in source data calls for the insertion of a new row into the dimension table, complete with a new surrogate key value. When the dimension design includes core and custom tables, the change must be applied both to the core dimension table and to any custom dimension tables. This will preserve their interchangeability when joined to a fact table. A curious side effect occurs when the changed values happen to be in custom columns. In the custom table, the old and new rows for the changed item will be visibly different. In the core table, however, the only difference between old and new rows will be the surrogate key value. In all other respects, the old and new versions will appear identical. Figure 13-4 illustrates this effect.
PRODUCT product_ key 100 101 102 103 104 105 201 sku B221101 N22911 B33921 A220022 Q27822 C770077 C770077 name Summer in New York product_ type Book
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These rows are identical in the core dimension table, save for their surrogate keys. They were precipitated by a type 2 change to the product's genre.
BOOK_PRODUCT product_ key 100 103 105 201 sku B221101 A220022 C770077 C770077 name Summer in New York The Contrarian Pathway Havana, 3AM Havana, 3AM product_ type Book Book Book Book author Michael Jones John Mellor P. Gustave Simonon P. Gustave Simonon genre Travel Lifestyle Fiction Classics cover_ type Paperback Paperback Hardcover Hardcover
Figure 13-4
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