3) The only indexes that can be created against table variables are primary key and unique constraints (and even then, people don't usually bother)
It's not a problem with 10 rows in the table (but then neither's the lack of stats). When you start putting several thousand rows in, joining the table variable, filtering on the table variable, etc, it becomes rather noticeable rather quickly
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