Query two tables then output in one column

i want to query two tables then give the result in one column eg

table1

id   name  town 
23   john  nyc
34   mark  ATl
44   ali   Dubs


table2

cno reg
45  kln
47  dsgd
28  wer

the output i expect is

newcolumn
   23
   34
   44
   45
   47
   28
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