ddl_statement 

<ddl_statement> ::=
  < create_table_statement >
| < drop_table_statement >
| < alter_table_statement >
| < rename_table_statement >
| < rename_column_statement >
| < exists_table_statement >
| < create_domain_statement >
| < drop_domain_statement >
| < create_sequence_statement >
| < drop_sequence_statement >
| < create_synonym_statement >
| < drop_synonym_statement >
| < rename_synonym_statement >
| < create_view_statement >
| < drop_view_statement >
| < rename_view_statement >
| < create_index_statement >
| < drop_index_statement >
| < alter_index_statement >
| < rename_index_statement >
| < comment_on_statement >
| < create_trigger_statement >
| < drop_trigger_statement >
| < create_dbproc_statement >
| < drop_dbproc_statement >