# File lib/criteria/sql.rb, line 316
    def to_s
      if @chain.size < 1
        s  = ""
        s << "#{@_parent.table}."     if(@_parent.table && @field.is_a?(Symbol))
        s << @field.to_s
        return s
      end

      s  = "("
      s << "#{@_parent.table}."       if(@_parent.table && @field.is_a?(Symbol))
      s << "#{@field.to_s} #{_translate_fn @chain[0]}"
      @chain[1...@chain.size].each {
        | item |
        s << " "
        s << "#{@_parent.table}."     if(@_parent.table && item.is_a?(Symbol))
        s << @_parent.class.translate_item(item)
      }

      s << ")"
      return s
    end