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I am going through the execution plan of a tsql query.

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There is a key LookUp (Clustered) in the plan. To avoid this Key LookUp, I tried to Include a column (Status_Ind) to The Index (The Index used in execution plan). But I realize that optimizer is using two Indexes, One the Primary Key index and the 2nd one, an index automatically created as a part of a Constraint (A UNIQUE NONCLUSTERED Index). I find no way to add an include part in this Index.

How do we add an INCLUDE in an index which is automatically created (through CONSTRAINTS)? I am really a beginner in Query optimization.

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It is not possible to have an INCLUDE column for an index that enforces a constraint. This has been brought up, but marked as "won't fix".

If the benefits of having a covering index are that great, consider revising the indexing strategy that you currently have on that table to maximize query performance.

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How do we add an INCLUDE in an index which is automatically created (through CONSTRAINTS)?

Answer: INCLUDE (column [ ,... n ] ) represents non key column, Column names cannot be repeated in the INCLUDE list and cannot be used simultaneously as both key and non-key columns.

Check Create Index Arguments--> Include and Create Indexes with Included Columns

I would advice to check different option and plan for indexes that you are looking for

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  • I think the OP is asking more about how to get INCLUDE columns when defining a constraint. Commented Sep 16, 2014 at 11:31
  • @ThomasStringer, You would be right, but OP need to confirm that we get it right or it mean something else? Commented Sep 16, 2014 at 12:21

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