Anti-nuisance lawsuit warning: The purpose of these notes is to remind me, Zoegond, of stuff or to help me work stuff out. They may contain mistakes.

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Monday, March 14, 2011

SQL Server unique clustered

Supposedly the 'primary key' constraint has the same effect as the 'unique clustered' one. But I have found that using the latter leads to a different execution plan (and much improved execution time) from the former.

Either way, if you're going to insert a lot of records into a temp table or table var, put a unique clustered constraint/index on it by some method.

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