What is the ratio between the number of object samples in image 1 and the number of object samples in image 6?
DIVIDE(SUM(OBJ_SAMPLE_ID where IMG_ID = 1), SUM(OBJ_SAMPLE_ID where IMG_ID = 6));
SELECT CAST(SUM(CASE WHEN IMG_ID = 1 THEN 1 ELSE 0 END) AS REAL) / SUM(CASE WHEN IMG_ID = 6 THEN 1 ELSE 0 END) FROM IMG_OBJ