Context: CREATE TABLE Engineer_Visits (engineer_id VARCHAR); CREATE TABLE Maintenance_Engineers (engineer_id VARCHAR, first_name VARCHAR, last_name VARCHAR)
Question: Among those engineers who have visited, which engineer makes the least number of visits? List the engineer id, first name and last name.
Answer: SELECT T1.engineer_id, T1.first_name, T1.last_name FROM Maintenance_Engineers AS T1 JOIN Engineer_Visits AS T2 ON T1.engineer_id = T2.engineer_id GROUP BY T1.engineer_id ORDER BY COUNT(*) LIMIT 1