CREATE TABLE Fault_Log (fault_log_entry_id VARCHAR); CREATE TABLE Engineer_Visits (fault_log_entry_id VARCHAR)
How many engineer visits are required at most for a single fault log? List the number and the log entry id.
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