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  • Dustin Waybright thinks this is interesting:

n example for manipulation of the filtered column is applying a function to it, as in F(col1) = 10, where F is some function. There are some exceptions to this rule, but they are very uncommon.


Cover of Training Kit (Exam 70-461): Querying Microsoft® SQL Server® 2012


Applying a function to a filtered column prevents SQL Server from making use of available indices.