code: public function compile()
  	{
  		$sql = array("UPDATE");
  		$sql[] = $this->table;
  		$sql[] = "SET";
  
  		$set = array();
  		foreach ($this->data as $key => $value)
  		{
  			$set[] = "{$key} = ?";
  			$this->params[] = $value;
  		}
  
  		$sql[] = join(', ', $set);
  
  		$sql = \array_merge($sql, $this->compileMixins());
  
  		return join(' ', $sql);
  	}
docs: Compiles the query into raw SQL
  
  @return  string