rchantler (10/9/2015)
You can even define the field to be UNIQUE in the table definition to get the effect.
That's enforced by a UNIQUE index, so it's the same as we have now. A unique index, clustered or not.
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden