What are the details of the lots which are not used in any transactions?
SELECT lot_details FROM Lots EXCEPT SELECT T1.lot_details FROM Lots AS T1 JOIN transactions_lots AS T2 ON T1.lot_id  =  T2.lot_id
SELECT lot_details FROM Lots EXCEPT SELECT T1.lot_details FROM Lots AS T1 JOIN transactions_lots AS T2 ON T1.lot_id  =  T2.lot_id
[{'lot_details': 'm'}, {'lot_details': 'q'}]