How To Change Variable Name

Hi:

In SQL:

How to change the variable name?

For example:
query1:
I have a input, which is [Please enter the value 1:]

Then,
I want to use this query, but different values.
I want to put [Please enter the value 2:]

In SQL, how can I write?

Select [Please enter the value 1:] As v1, Please enter the value 2:] As v2 from combine
Union
Select * from query1
Union
Select * from query1 where [Please enter the value 1:] = [Please enter the value 2:]