sql - how to use concat columns of same table in Where condition -

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user_id  | email_id  | type  --------------------------------------- 000121  | test1234   | ext 000125  | best_21    | lot 000128  | lite_21@   | ext

i want use like 

select * tablename concat (emailid,'',type) 'test1234 ext'

but query not working

why not use

select * tablename emailid 'test1234' , type ' ext'

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