anchor.diff:      ;
   
   groupByClause
  -    : GROUP BY groupByItem (COMMA groupByItem)* 
  -    (WITH ROLLUP)? 
  -    havingClause?
  +    : GROUP BY groupByItem (COMMA groupByItem)* (WITH ROLLUP)? havingClause?
       ;
   
   havingClause
  
positive.code:     ;
  
  update: 
      updateClause 
      setClause 
      whereClause? 
      orderByClause? 
      limitClause?
      ;
  
  setClause 
  
negative.code: import Keyword, MySQLBase, DQLBase, BaseRule, DataType, Symbol;
  
  execute
      : select | insert | update | delete
      ;
  
  fromClause 
  