sql server - Correct way to perform Sql self union -

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let's have table below: 

table1:  **t1**   **t2**   **t3**  abc       xyz      aaa

can like: 

select * from( (select t.t1,t.t2,t.t3 table1 t) tmp union (select tmp2.t1,'someothervalue' t2,tmp2.t3 tmp tmp2)) result order result.t1

basically union operation first tmp table itself. let's t1,t2,t3 of varchar type.

from tmp tmp2 not possible instead of use from table1 tmp2, updated sql query 

select * from(      select t.t1,t.t2,t.t3 table1 t union      select tmp2.t1,'someothervalue' t2,tmp2.t3 table1 tmp2 ) result order result.t1

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