list both the countries with mountains height less than 5200 and height more than 5600 in the same table
SELECT Country FROM mountain WHERE Height  >  5600 INTERSECT SELECT Country FROM mountain WHERE Height  <  5200
countries with mountains height less than 5200 and more than 5600 in the same table refers to using INTERSECT between two SELECT queries; one for Height < 5200 and another for Height > 5600;