For running J!5.1 you must https://fabrikar.com/forums/index.php?wiki/update-from-github/ or include the new file manually https://fabrikar.com/forums/index.php?threads/joomla-5-1-and-fabrik-cannot-find-files-error.54473/post-285151 See also Announcements
Please see our announcement here.
Fabrik has a placeholder {$my->id} so you can do
WHERE name ='{$my->id}'
You can't use php code in the Data-where field, it's only for SQl and only one SQL statement.
http://fabrikar.com/forums/index.php?wiki/database-join-element/#data-where
Fabrik has a placeholder {$my->id} so you can do
WHERE name ='{$my->id}'