If-lus in 'Then'-instructie van Case-instructie in SQL Server 2008

Nest ze

CASE
   WHEN foo = 'bar' THEN 
              CASE
                 WHEN black = 'white' THEN .. 
                 WHEN W = 'TF' THEN ... 
                 ELSE
              END
   WHEN fish = 'bicycle' THEN ... 
   ELSE ... 
END