Description of create_flexible_domain

CREATE [ USECASE ] FLEXIBLE DOMAIN [IF NOT EXISTS ][ schema .]domain_name
    ( domain_column [ , domain_column... ] )     
    CHOOSE DOMAIN USING ( domain_discriminant_column datatype)[ , domain_discriminant_column datatype...] )   
FROM  
  { DECODE (expr , (search_expr , result_expr) [, search_expr , result_expr ]...[ , default ] ) 
   | case_expression
  }