I have a temporary table that I’m using and I have a unique column, example:myID INT UNIQUE
Would this create an index on that column? Or do I have to explicitly create the index?
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I have a temporary table that I’m using and I have a unique column, example:myID INT UNIQUE
Would this create an index on that column? Or do I have to explicitly create the index?
Yes, SQL server will automatically create an index for each additional unique constraint.
http://msdn.microsoft.com/en-us/library/ms177420.aspx
“The Database Engine automatically creates a UNIQUE index to enforce the uniqueness requirement of the UNIQUE constraint….Unless a clustered index is explicitly specified, a unique, nonclustered index is created by default to enforce the UNIQUE constraint.”
This is true for temporary tables, which I just verified by testing.