Specify data type with column alias in SQL Server 2008

Question

Imagine I have the following SELECT statement in a view (SQL Server 2008):

SELECT (SELECT CASE 
                 WHEN HISTORY.OUTOFSERV = 'Y' OR HISTORY.OUTOFSERV = 'y' THEN 1 
                 ELSE 0 
               END) AS OOS 
  FROM HISTORY

The column OOS ends up being of type int, but I'd like it to be of type bit. How can I accomplish this?

Answer 1

Use CAST/CONVERT to explicitly define the data type:

SELECT CAST (CASE 
               WHEN LOWER(h.outofserv) = 'y' THEN 1 
               ELSE 0 
             END AS BIT) AS OOS 
 FROM HISTORY h