How to concatenat or bind any hard code value with database returned value?

I am writing a select query like that "select Data from table1 where 1d=1" that will return me output like that

id   Data
1     10

now i want output like that

id  Temp  Data
1    2     10 

the query "select '2',Data from table1 where 1d=1" give me the required output.But when database return null It should be like that

id  Temp  Data
1    2    null

But it will return 0 row.Kindly tell me the query to get the required output . Thanks in advance.