[프로그래머스] 카테고리 별 상품 개수 구하기

-- 코드를 입력하세요
SELECT
     SUBSTR(PRODUCT_CODE, 0, 2) AS CATEGORY
    ,COUNT(PRODUCT_ID) AS PRODUCTS
    FROM PRODUCT
    GROUP BY SUBSTR(PRODUCT_CODE, 0, 2)
    ORDER BY CATEGORY;