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Merge pull request #4435 from barbkess/livefyre
fix applies to for SQL DW and PDW
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docs/relational-databases/tables/use-sparse-columns.md

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# Use Sparse Columns
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[!INCLUDE[tsql-appliesto-ss2016-all-md](../../includes/tsql-appliesto-ss2016-all-md.md)]
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[!INCLUDE[tsql-appliesto-ss2016-asdb-xxxx-xxx-md](../../includes/tsql-appliesto-ss2016-asdb-xxxx-xxx-md.md)]
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Sparse columns are ordinary columns that have an optimized storage for null values. Sparse columns reduce the space requirements for null values at the cost of more overhead to retrieve nonnull values. Consider using sparse columns when the space saved is at least 20 percent to 40 percent. Sparse columns and column sets are defined by using the [CREATE TABLE](../../t-sql/statements/create-table-transact-sql.md) or [ALTER TABLE](../../t-sql/statements/alter-table-transact-sql.md) statements.
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docs/relational-databases/views/create-indexed-views.md

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# Create Indexed Views
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[!INCLUDE[tsql-appliesto-ss2008-asdb-asdw-pdw-md](../../includes/tsql-appliesto-ss2008-asdb-asdw-pdw-md.md)]
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This topic describes how to create an indexed view in [!INCLUDE[ssCurrent](../../includes/sscurrent-md.md)] by using [!INCLUDE[tsql](../../includes/tsql-md.md)]. The first index created on a view must be a unique clustered index. After the unique clustered index has been created, you can create more nonclustered indexes. Creating a unique clustered index on a view improves query performance because the view is stored in the database in the same way a table with a clustered index is stored. The query optimizer may use indexed views to speed up the query execution. The view does not have to be referenced in the query for the optimizer to consider that view for a substitution.
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[!INCLUDE[tsql-appliesto-ss2008-asdb-xxxx-xxx-md](../../includes/tsql-appliesto-ss2008-asdb-xxxx-xxx-md.md)]
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This topic describes how to create indexes on a view. The first index created on a view must be a unique clustered index. After the unique clustered index has been created, you can create more nonclustered indexes. Creating a unique clustered index on a view improves query performance because the view is stored in the database in the same way a table with a clustered index is stored. The query optimizer may use indexed views to speed up the query execution. The view does not have to be referenced in the query for the optimizer to consider that view for a substitution.
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## <a name="BeforeYouBegin"></a> Before You Begin
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The following steps are required to create an indexed view and are critical to the successful implementation of the indexed view:

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