Simplify nested case when statement

Question

Below is my current SELECT CASE statement:

SELECT CASE 
WHEN edition = \'STAN\' AND has9 = 1 THEN \'9\'
WHEN edition = \'STAN\' AND has8 = 1 THEN \'8\'
WHEN          


        

Answer 1

You can nest your case when.

By the way, when you make a case on a single field, you can do

case  when 
             when 

rather then

 case when  = 
      when  = 

So

case edition
      when 'STAN'
         case when has9 = 1 then '9'
              when has8 = 1 then '8'
              when has7 = 1 then '7'
              when hasOLD = 1 then 'OLD'
         end
     when 'SUI'
         case when has_s9 = 1 then 'S9'
              when has_s8 = 1 then 'S8'
         end
     else 'S7'
end as version