May 2019
Intermediate to advanced
484 pages
11h 23m
English
Content preview from Learn T-SQL Querying
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Columnstore indexes
In Chapter 4, Exploring Query Execution Plans, we introduced columnstore indexes. Columnstore indexes are different than rowstore indexes (clustered and non-clustered) in that all the data from a single column is stored together in a highly compressed format, rather than the entire row being stored together. This type of data storage is useful for data warehouse type queries—queries that need to search, aggregate, and return large amounts of data. Consider the following query against the AdventureWorksDW database:
SELECT s.ProductKey, p.EnglishProductName, SUM(s.OrderQuantity) as TotalQuantity, SUM(s.TotalProductCost)as TotalSales,MAX(s.OrderDate)as LastSaleDateFROM FactResellerSalesXL_PageCompressed sINNER JOIN DimProduct ...
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