sql - Upper case in ALIAS for column Name not working -

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in following select statement firstname , middlename alias not appear. want column header in uppercase. 

select  dbo.employee.title sal,         dbo.employee.firstname firstname,         dbo.employee.middlename middlename dbo.employee

i have tried , works fine me. however, here suggested change sql may assist.

select title [sal],        firstname [firstname],        middlename [middlename] dbo.employee

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