anchor.diff:      : ELEMENT? IS OF TYPE? LP_ ONLY? dataTypeName_ RP_ | NOT? SUBSTITUTABLE AT ALL LEVELS
       ;
   
  -createIndex
  -    : CREATE (UNIQUE | BITMAP)? INDEX indexName ON (tableIndexClause_ | bitmapJoinIndexClause_)
  -    ;
  -
   tableIndexClause_
       : tableName alias? LP_ indexExpr_ (COMMA_ indexExpr_)* RP_
       ;
  
positive.code:     : CREATE (GLOBAL TEMPORARY)? TABLE tableName relationalTable
      ;
  
  alterTable
      : ALTER TABLE tableName (alterTableProperties | columnClauses | constraintClauses | alterExternalTable)?
      ;
  
  dropTable
      : DROP TABLE tableName
      ;
  
  truncateTable
  
negative.code:     : tableName alias? columnName (ASC | DESC)?
      ;
  
  
  