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More than a two-part column name - Depricated Features

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Was looking at deprecated features in future versions of SQL in the [b]sys.dm_os_performance_counters table[/b]. Trying to figure out what code changes we need to start implementing. Most of what I'm looking at makes perfect sense; no more - [b]text - ntext or image[/b] data types; sysobjects to sys.objects; etc. One thing that I'm having a hard time wrapping my head around is the "More than two-part column name" getting deprecated in future versions of SQL?Per Microsoft - "A query used a 3-part or 4-part name in the column list. Change the query to use the standard-compliant 2-part names. Occurs once per compilation."Question: Why on earth would Microsoft (or anyone) care? What possible harm could it be doing?

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