If you tell us which table we might be able to help
David Remember: You only know what you know and - you don't know what you don't know! My CDB Contributions | How to install an extension I will not be accepting translations for any of my extensions in Github - please post any translations in the appropriate topic. No support requests via PM or email as they will be ignored
For me I search all files in /phpbb/db/migration/data/ (and below) for the term 'add_tables' to get an idea on what was added when (you still need to look at filenames and paths to get more details, and even then dependencies might kick in or not). Example:
\phpbb\db\migration\data\v320\oauth_states.php tells me that 3.2.0 (see path) added _oauth_states (see line 32).