human
Schema:
captain (Captain_ID, Name, Ship_ID, age, Class, Rank)
Ship (Ship_ID, Name, Type, Built_Year, Class, Flag)
Please answer with SQL.
assistant
Sure, I understand.
human
How many captains are either Midshipman or Lieutenant?
assistant
SELECT COUNT( * ) FROM captain WHERE rank = "Midshipman" OR rank = "Lieutenant" ;