How to union ranges in google spreadsheets

Question

I want to union ranges from any Google spreadsheets.

The example

Sheet1!A:A

{12, 131, 45} 

Sheet2!A:A

{12, 131, 46} 

The unknown function

=formula_for_union_range(Sheet1!A:A; Sheet2!:A:A) 

should return

{12, 131, 45, 12, 131, 46} 

The question

How is it possible?

Answer 1

Just use:

={sheet1!a:a; sheet2!a:a}