[Therion] How to extract the length of each centerline ?

Hi all, I am still working on the survey of the Jean-Bernard system in the French Alps. I have a bunch of different centerlines series, and I need to extract the length of each centerline to link them to the history of the exploration/surveying. I understood how to export the SQL database of the cave system, however, as I do not know at all how to deal with SQL databases, I wondering if there is there an easy way to extract this information with a command similar to "export survey-list" ? The best will be an output like "centerline_ID - Station_first - Station_last - Centerline_length - Topo_date" ! Cheers, Xavier