T-SQL field alias options

Is there a best practice or any other compelling reason to use one of these techniques over the other?

Select FirstName
     , LastName
     , (FirstName + ', ' + LastName) As [LongName] ...

Select FirstName
     , LastName
     , LongName = (FirstName + ', ' + LastName) ...

The estimated execution plan looks identical for both so I'm not sure if there is any reason "As [LongName]" is any better or worse than "LongName ="

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asked May 13 '10 at 02:32 PM in Default

user-1783 gravatar image

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2 answers: sort voted first

The simple answer is that the AS clause is the ISO standard.

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answered May 13 '10 at 02:53 PM

Blackhawk-17 gravatar image

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This is enough reason for me to use As rather than =. T-SQL is moving more towards ISO with each new version. The less code I have to rewrite later the better!

May 14 '10 at 09:20 AM user-1783
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or any other compelling reason...

I tend to use brackets for column aliases and = for functions and expressions that tend to be longer such as:

rn = ROW_NUMBER() OVER.... where it is more readily apparent what rn represents instead of having to look at the end of the statement for: AS [rn].

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answered May 13 '10 at 07:03 PM

Scot Hauder gravatar image

Scot Hauder
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asked: May 13 '10 at 02:32 PM

Seen: 806 times

Last Updated: May 13 '10 at 02:32 PM