Description of the illustration query_block.eps

  [ with_clause ]
SELECT [ hint ] [ { { DISTINCT | UNIQUE } | ALL } ] select_list
  FROM { table_reference | join_clause | ( join_clause ) }
         [ , { table_reference | join_clause | (join_clause) } ] ...
  [ where_clause ]
  [ hierarchical_query_clause ]
  [ group_by_clause ]
  [ model_clause ]