Description of the illustration query_block.eps

  [ with_clause ] SELECT [ hint ] [ { { DISTINCT | UNIQUE } | ALL } ] select_list
  [  non_join_to_one_from_clause | join_to_one_from_clause  ]
  [ where_clause ]
  [ hierarchical_query_clause ]
  [ group_by_clause ]
  [  model_clause | window_clause  ] 
  [ qualify_clause ]