What is the syntax for a CASE statement in Crystal XI

Question

I'm having difficulty locating documentation for the use of CASE statements in Crystal syntax. My database administrator does not allow me to write SQL expressions so I need to covert the SQL below to Crystal Syntax. Can anyone help me? Thank you very much!!
Select
   CASE
         WHEN projects.ProjType like 'S%' then 'Shopping Center'
         WHEN projects.ProjType like 'I%' then 'Industrial'
         WHEN projects.ProjType like 'O%' then 'Office Building'
         ELSE 'Other'
   END
from projects

Answer 1

Let's assume column XYZ has both numbers (1), and letters (any alphabet).
I have a case statement on SQL to turn any value that's not 1 into 0, then I am getting a sum of that column.
I am also grouping by Row A, B etc to get aggregated sum of column XYZ for those group.
Now on Crystal Reports function, I need to sum up values under column XYZ for all the groups.
If I try using sum function like below, I get an error stating:
"A number field or currency amount field is required here"
(sum({Command.XYZ}))
So I thought if I can use a case statement to change the non-numbers to 0 prior to sum that will probably resolve it. But I could not get the below case statement to work either (Error: A string is required). 
SELECT {Command.XYZ}
   Case 1:
      1 
   Default:
      0;