# File lib/arel/engines/sql/relations/compiler.rb, line 144
      def limited_update_conditions(conditions, taken)
        conditions << " LIMIT #{taken}"
        quoted_primary_key = @engine.connection.quote_column_name(relation.primary_key)
        "WHERE #{quoted_primary_key} IN (SELECT #{quoted_primary_key} FROM #{@engine.connection.quote_table_name relation.table.name} #{conditions})"
      end