Reference an alias elsewhere in the SELECT list

Question

I have the following query:

    select FirstName, LastName,
    Case
     When LastName = \'Jones\'
     then \'N/A\'
    End as Other,
    Case 
      When          


        

Answer 1

You can also do this with a common table expression (CTE):

;WITH cte AS 
(
SELECT 
    firstname, 
    lastname, 
    CASE WHEN lastname = 'Jones' THEN 'N/A' 
    END AS Other 
FROM @t
) 
SELECT 
    firstname, 
    lastname, 
    CASE WHEN other IS NOT NULL THEN 1 
        ELSE 0 
    END AS Flag 
FROM cte