sql server 2008 - How to get union of two tables with different alias -

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i want union want show 1 column twice different alias. e.g

select first table1  union  select second table1

it shows first output.

but want show both first , second. how can achieved in mssql?

union combines results 2 queries 1 set of columns. there's no way make column name change halfway down. closest can think of 

select first , null second  table1   union   select null first , second  table1

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