[subquery_factoring_clause] SELECT [hint] [ { DISTINCT | UNIQUE } | ALL ] select_list FROM table_reference [, table_reference]... [WHERE condition] [{ hierarchical_query_clause | group_by_clause } [ hierarchical_query_clause | group_by_clause ]...] [ UNION | UNION ALL | INTERSECT | MINUS } ( subquery )] [order_by_clause]
For information on the symbols and conventions of Backus-Naur Form (BNF) syntax, see Appendix A.