query execution plan : missing index

Question

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There are two tables that I join them together, one of them is a temp table and I create an index after

Answer 1

The "Missing index" hint that is displayed is your best starting point. SQL Server has detected you would get better performance by adding the index that it tells you to.

It's difficult to be specific as really need to know what your SELECT statement is as a number of things could cause a scan to be done instead of seek.

As an example, I recently blogged about how the structure of your WHERE clause for (e.g.) date filtered queries, can turn seeks into scans - in this instance things to look out for are the use of functions within the WHERE clause.