Find the object in image 5 where the object with the coordinate of (634, 468).
object in image 5 refers to OBJ_SAMPLE_ID where IMG_ID = 5; coordinates of (634, 468) refer to X and Y coordinates of the bounding box in which X = 634 and Y = 468;
SELECT OBJ_SAMPLE_ID FROM IMG_OBJ WHERE IMG_ID = 5 AND X = 634 AND Y = 468