What is the relation between object sample no.8 and object sample no.4 in image no.1?
relation refers to PRED_CLASS; object sample no.8 and object sample no.4 refers to OBJ1_SAMPLE_ID = 8 AND OBJ2_SAMPLE_ID = 4; image no.1 refers to IMG_ID = 1
SELECT T1.PRED_CLASS FROM PRED_CLASSES AS T1 INNER JOIN IMG_REL AS T2 ON T1.PRED_CLASS_ID = T2.PRED_CLASS_ID WHERE T2.IMG_ID = 1 AND T2.OBJ1_SAMPLE_ID = 8 AND T2.OBJ2_SAMPLE_ID = 4