# File lib/tapkit/access/sql.rb, line 682
                def sql_for_function( function, column_name )
                        case function
                        when AggregateSpec::AVG then
                                sql_for_average_function(column_name)
                        when AggregateSpec::MAX then
                                sql_for_max_function(column_name)
                        when AggregateSpec::MIN then
                                sql_for_min_function(column_name)
                        when AggregateSpec::COUNT then
                                sql_for_count_function(column_name)
                        when AggregateSpec::COUNT_ALL then
                                sql_for_count_all_function(column_name)
                        end
                end