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Index on a Column with NULLs


Index on a Column with NULLs

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AndrewSQLDBA
AndrewSQLDBA
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Hello Everyone
I hope that everyone is having a great weekend.

I am looking over some tables and index plan that is currently in place. I see some queries that use other columns that have a non-clustered index, but then also adds one column that is not in the index. The one column currently has all NULL values. I am trying to learn how an index works with NULLs. I would greatly appreciate any advice on using / creating index on a column with NULL values. I have read the BOL, but still a little uncertain about this topic.

How would this affect the performance of an index?

I greatly appreciate any and all comments/suggestions.

Thanks in advance
Andrew SQLDBA
GilaMonster
GilaMonster
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No effect. As far as an index is concerned, null is just another value.

Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
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


AndrewSQLDBA
AndrewSQLDBA
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Thanks Gila
Greatly appreciate your time. You always have the answer to my odd type questions.

Andrew SQLDBA
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