sql - SQL Data type query performance

Question

Using SQL Server 2008, is it faster to do a query to find uniqueidentifier or can you use any of the string data types, like nvarchar without any significant penalty? Note that I'm not talking about a primary key field, just any old field

Answer 1

不同的数据类型对性能有不同的影响。根据上下文，某些数据类型可能比其他数据类型更有利。请务必考虑创建了哪些索引，因为它们会对查询的运行速度产生重大影响。