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

Try this

SELECT CASE 
WHEN edition = 'STAN' THEN 
     CASE 
          WHEN has9 = 1 THEN '9'
          WHEN has8 = 1 THEN '8'
          WHEN has7 = 1 THEN '7'
          WHEN hasOLD = 1 THEN 'OLD'
     END
WHEN edition = 'SUI' THEN
     CASE 
          WHEN has9 = 1 THEN 'S9'
          WHEN has8 = 1 THEN 'S8'
     END
ELSE 'S7' END AS version