What Is a Snowflake Schema? Asnowflake schema is (Free web host)
What Is a Snowflake Schema? Asnowflake schema is shown in Figure 7-4. Asnowflake schema is a normalized star schema, such that dimension entities are normalized (dimensions are separated into multiple tables). Normalized dimensions have all duplication removed from each dimension, such that the result is a single fact table, connected directly to some of the dimensions. Not all of the dimensions are directly connected to the fact table. In Figure 7-4, the dimensions are grayed out in two shades of gray. The lighter shade of gray represents dimensions connected directly to the fact table (BOOK, AUTHOR, SUBJECT, SHIPPER, and CUSTOMER). The darker-shaded gray dimensional tables, are normalized subset dimensional tables, not connected to the fact table directly (PUBLISHER, PUBLICATION, and CATEGORY). Figure 7-4: The SALE table fact-dimensional structure. Customer customer_id Shipper shipper_id shipper address phone email customer address phone email credit_card_type credit_card# credit_card_expiry Book ISBN publication_id (FK) publisher_id (FK) edition# print_date pages list_price format rank ingram_units Sale sale_id ISBN (FK) author_id (FK) shipper_id (FK) customer_id (FK) subject_id (FK) sale_price sale_date Publisher publisher_id publisher Author author_id author Publication publication_id title Subject subject_id category_id (FK) subject Category category_id category 178 Chapter 7
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