SELECT TYPE FROM ship WHERE Tonnage  >  6000 INTERSECT SELECT TYPE FROM ship WHERE Tonnage  <  4000
Show the types of ships that have both ships with tonnage larger than 6000 and ships with tonnage smaller than 4000.
SELECT TYPE FROM ship WHERE Tonnage > 6000 INTERSECT SELECT TYPE FROM ship WHERE Tonnage < 4000
select type from ship where tonnage > value intersect select type from ship where tonnage < value
Show the types of ships that have both ships with tonnage larger than 6000 and ships with tonnage smaller than 4000 .