Q1: select * from Rel where X = 'd' and Y = 4 Q2: select * from Rel where 'j' < X ≤ 'r' Q3: select * from Rel where X > 'm' and Y > 4 Q4: select * from Rel where 'k' ≤ X ≤ 'p' and 3 ≤ Y ≤ 6