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