Database: tracking_share_transactions
Question: What are the lot details of lots associated with transactions whose investor id is bigger than 8 and whose type code is "PUR"?
SQL: select t1.lot_details from lots as t1 join transactions_lots as t2 on  t1.lot_id  =  t2.transaction_id join transactions as t3 on t2.transaction_id  =  t3.transaction_id where t3.investor_id  >  8 and t3.transaction_type_code  =  "pur"