Question: How many engineer visits are required at most for a single fault log? List the number and the log entry id.
SQL: SELECT count ( * )  ,  T1.fault_log_entry_id FROM Fault_Log AS T1 JOIN Engineer_Visits AS T2 ON T1.fault_log_entry_id   =   T2.fault_log_entry_id GROUP BY T1.fault_log_entry_id ORDER BY count ( * )  DESC LIMIT 1