SQL编写出现的展示

编写的SQL：

SELECT bc.class_name,bc.class_id,COUNT(b.buying_id) AS counter FROM buying_class bc,buying  b
WHERE bc.class_id = SUBSTR(b.class_id,1,6)
AND LENGTH(bc.class_id)=6 AND b.validity='1'
GROUP BY bc.class_id

展示效果图：