March 2022
Intermediate to advanced
682 pages
22h 58m
English
Content preview from Databases Illuminated, 4th Edition
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15.9 Views and View Materialization
Views play an important role in data warehouses, as they do in operational databases, in customizing the user’s environment. SQL operators, including OLAP operators, can be performed on views as well as on base tables. The SQL CREATE VIEW command simply defines the view and does not create any new tables. When a query is written on a view, one way it can be executed is through query modification, which replaces the reference in the WHERE line by the view definition. For example, we can have a view, BestSalespeople, created from the Salespersons table pictured in Figure 15.4(A) defined by
CREATE VIEW BestSalespeople
AS SELECT S.salespersonId, S.lastName, S.firstName, S.phone, S.totalSalesYTD
FROM Salespersons ...
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