barcode vb.net 2010 This simple view will only include rows from the order_facts table that refer to book products. in Software

Printer QR Code ISO/IEC18004 in Software This simple view will only include rows from the order_facts table that refer to book products.

This simple view will only include rows from the order_facts table that refer to book products.
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Fact Table Design
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TIP When a design involves core and custom dimensions, also include custom versions of fact tables, even if there are no custom facts. This will avoid potential confusion at query time. The use of views may have negative performance implications. Queries will be written as if the view were a fact table. They will join it to dimensions such as day, customer, or even book_product. Because the view itself contains a join, the database may not choose the optimal plan for query execution. Depending on the behavior of the relational database, it may be more appropriate to build a separate table or make use of a materialized view, materialized query table, or the like. Database administrators should be consulted when choosing an implementation approach. If separate fact tables are not built for each custom star, you may find it difficult to get your data modeling software to define the relationships among all the tables of the solution. The database administrator, too, may find it difficult to tune the database effectively. These problems stem from the fact that any fact table containing a foreign key reference to the dimension in question must be defined as referring to the core dimension table. The modeling tool or RDBMS will likely not acknowledge that the fact table foreign key can alternatively refer to one or more custom dimension tables. In the case of the modeling tool, this shortcoming may be overcome via text-based documentation addenda. In the case of the RDBMS, the database administrator may use hints or additional indices, or simply create a custom fact table with the appropriate foreign key definition.
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Type-Specific Facts
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When special facts are associated with particular types, custom fact tables become mandatory. The core fact table will contain rows for all types and will contain facts that are common across all types. Custom fact tables will be built for each type. These contain the core facts, plus any type-specific custom facts. As with dimension tables, conformance is the order of the day; the common facts must share the same structure and content. Suppose, for example, that the types of product from Figure 13-2 happen to have some facts of their own. A subscription includes the length of the subscription term in issues and the value of the subscription at cover price. A book order, on the other hand, includes quantity, extended cost dollars, and various other facts. The core and custom stars in Figure 13-6 add these custom facts. Notice that all stars have the core fact order_dollars. As before, analysis is conducted by first choosing the appropriate star. Analysis across all types is performed using the core star; it will be limited to core facts and dimensions. Analysis that will require facts or dimensions that are specific to a particular type is performed using the appropriate custom star; it will be limited to transactions of the particular type.
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Some variations on the custom star technique should be noted. First, it may be possible for a particular item to appear in more than one custom dimension table. This occurs when multiple levels of types exist, resulting in overlapping sets of custom attributes. Second, some designers prefer not to replicate core attributes, opting for a snowflake-like alternative. Last, the core and custom technique can be combined with an attribute hierarchy for powerful effect.
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13 Type-Specific Stars 317
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ORDER_FACTS day_key customer_key product_key transaction_id order_dollars PRODUCT
CUSTOMER
Core Star BOOK_ORDER_ FACTS day_key customer_key product_key transaction_id order_dollars quantity cost_dollars margin_dollars sales_tax discount_dollars BOOK_ PRODUCT Custom Stars
CUSTOMER
Book-specific facts
SUBSCRIPTION_ ORDER_FACTS
CUSTOMER
number_issues cover_value
Subscriptionspecific facts
Figure 13-6
Custom stars with type-specific facts
Overlapping Custom Dimensions
Core and custom stars correspond to generalized and detailed views of an item, respectively. Sometimes there is more than one level of type within a dimension. When there are types within types, it is possible to design multiple levels of custom stars. A core star contains attributes common across all types; first-level custom stars contain the core attributes plus attributes specific to first-level types; a second set of custom stars adds attributes common to second-level types. In cases like this, a single item will appear in the core star, a type-specific star, and a second-level type-specific star. For example, products sold by a retailer may have some attributes that are common across all products, some that are category-specific, and some that are product-type specific. A shirt, for example, has a product name and SKU, as does every other product sold. It also
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