i dont think an index can be indexed. When you query a table having index and the where clause contains a column on which index is built, the index is used in the execution plan.
When an index is created queries queries can use it immediately.
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
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