Question: Show the ids and details of the investors who have at least two transactions with type code "SALE".
SQL: SELECT T2.investor_id ,  T1.Investor_details FROM INVESTORS AS T1 JOIN TRANSACTIONS AS T2 ON T1.investor_id  =  T2.investor_id WHERE T2.transaction_type_code  =  "SALE" GROUP BY T2.investor_id HAVING COUNT(*)  >=  2