题解 | #列出供应商及其可供产品的数量#
列出供应商及其可供产品的数量
https://www.nowcoder.com/practice/17f22851cf204019b51a36761a3afc79
SELECT
V.vend_id,
COUNT(prod_id) AS prod_id
FROM
Vendors AS V
LEFT OUTER JOIN Products AS P ON V.vend_id = P.vend_id
GROUP BY
V.vend_id
ORDER BY
V.vend_id;