SQL Server/T-SQL/System/USER NAME

select USER_NAME()

   <source lang="sql">

4> SELECT GETDATE(), USER_NAME(), SUSER_SNAME(), 5> USER_NAME(), USER_NAME() 6> GO

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2008-08-17 13:20:57.703 dbo J\Administrator

                                                                                 dbo
          dbo

(1 rows affected) 1>

</source>