SQL$HELP_OLD72.HLB

  case-statement =

  CASE value-expr --------+
  +-----------------------+
  ++-> WHEN -+-+> <literal> -+-+-> THEN -+-> compound-use-statement -+-+-+
   |         | +> NULL ------+ |         +------------<--------------+ | |
   |         +----- , <--------+                                       | |
   +---------------------------------<---------------------------------+ |
    +--------------------------------<-----------------------------------+
    ++----------------------------------------+--> END CASE --->
     +--> ELSE -+-> compound-use-statement -+-+
                +------------<--------------+