>>No. The Table Designer generates appropriate DDL statements required to delete such index. You can see them if you click on generate script toolbar button before saving the changes made to a table.
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>Thank you. I will have to look into this feature "generate script toolbar button"; I don't think I ever used it or noticed it.
>
>In general, if I want to create a unique column index/constraint (to be used in the FK of a child table), is it better to do it as an index or as a constraint?

Take a look at this discussion on this very topic http://social.msdn.microsoft.com/Forums/en-US/databasedesign/thread/d7775749-5f9b-4449-acbe-936b8f5cfc5d