public virtual void Visited(SqlHavingClause havingClause)
 {
     //
 }
 public virtual void Visiting(SqlHavingClause havingClause)
 {
     //sqlBuilder.Append("Having ");
 }
 private void SetupClauses()
 {
     this.sqlSelectClause = new SqlSelectClause(this);
     this.sqlIntoClause = new SqlIntoClause(this);
     this.sqlFromClause = new SqlFromClause(this);
     this.sqlWhereClause = new SqlWhereClause(this);
     this.sqlGroupByClause = new SqlGroupByClause(this);
     this.sqlHavingClause = new SqlHavingClause(this);
     this.sqlOrderByClause = new SqlOrderByClause(this);
 }