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 Vendors.vend_id, count(prod_id) as prod_id from Vendors left join Products on Vendors.vend_id = Products.vend_id group by vend_id order by vend_id