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 vd.vend_id, 
COALESCE(COUNT(prod_id),0) AS prod_id
FROM Vendors AS vd
LEFT JOIN Products AS p
ON vd.vend_id = p.vend_id
GROUP BY vend_id
ORDER BY vend_id

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