There are 4 columns:
player_id, skillid, value, count
To edit the skills of a player, first you need to get its playerId(or GUID). For example id 22.
So if you want to edit the fist fighting of that player, you need to browse player_id 22 and skillid 0, and edit that row.
value is the level of the skill and I guess count is the number of tries.
I hope this helps.