# File lib/criteria/sql.rb, line 189
    def _mkselect(s, *args)
      # SELECT and column clause
      s << "SELECT "
      s << args.map {
        |s|
        if s.is_a?(SQLTable); "#{s}.*"
        else                  s.to_s
        end
      }.join(", ")

      s << "*" unless args.size > 0
    end