code: public function having( $column, $param1 = null, $param2 = null ) {
  		$this->statements['having'] = $this->generateWhere( $column, $param1, $param2, 'having' );
  
  		return $this;
  	}
docs: Generate Having clause
  
  @param string $column The SQL column.
  @param mixed  $param1 Operator or value depending if $param2 isset.
  @param mixed  $param2 The value if $param1 is an operator.
  
  @return self The current query builder.