Define the bounding box of the object sample no. 7 on image no. 42.
bounding box of the object refers to (X, Y, W, H); sample no.7 on image no.42 refers to IMG_ID = 42 and OBJ_SAMPLE_ID = 7
SELECT X, Y, W, H FROM IMG_OBJ WHERE IMG_ID = 42 AND OBJ_SAMPLE_ID = 7