Question

What would be the best way of doing this?

select 'blah' as foo,
        CASE 
          WHEN foo='blah' THEN 'fizz'
          ELSE 'buzz'
        END as bar

As it is written right now I get an invalid column name 'foo' error. Is there anyway to do this where the select statement could be used as a view?

Answer 1

You need to use a nested select like this:

select foo,
  case when foo='blah'
  then 'fizz'
  else 'buzz'
  end as bar
from ( select 'blah' as foo ) a

The problem is that the column foo is not recognized by the name in the same select statement.