How to select a record with an attribute which is maximal in mnesia table?

[钱晓明]

Hi, I want to select a record with an attribute which is maximal from mnesia
table, so should I use qlc?
For example, I have to insert a record into a table every 5 minutes, and
when my program start up, it should read the last record to get some
information.
So how can I achieve this?

Thanks!