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Database Design - What are included columns...
Database Design - What are included columns with respect to SQL Server indexing?
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Sree Arjun Div
Sree Arjun Div
Posted Wednesday, February 17, 2010 5:50 AM
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Database Design - What are included columns with respect to SQL Server indexing?
Post #866919
GilaMonster
GilaMonster
Posted Wednesday, February 17, 2010 6:23 AM
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Test question? Interview question?
Search in Books Online for 'Include columns' you should find several entries.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #866963
egpotus
egpotus
Posted Tuesday, April 16, 2013 1:32 AM
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What are included columns with respect to SQL Server indexing?
A new type of index was developed in SQL Server 2005 and beyond that assists in situations where a covering index is needed.
Indexes with Included Columns are non clustered indexes that have the following benefits:
1. Columns defined in the include statement, called non-key columns, are not counted in the number of columns by the database engine.
2. Columns that previously could not be used in queries, like nvarchar(max), can be included as a non-key column.
3. A maximum of 1023 additional columns can be used as non-key columns.
Kindest Regards,
egpotus DBA
Post #1442623
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