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
a.vend_id,
coalesce(count(prod_id),0) as prod_id
from
Vendors a
left join
Products b on a.vend_id = b.vend_id
group by
1
order by
1
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