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
http://www.nowcoder.com/practice/17f22851cf204019b51a36761a3afc79
SELECT v.vend_id vend_id, COUNT(p.prod_id) prod_id FROM Vendors v LEFT JOIN Products p ON v.vend_id = p.vend_id GROUP BY v.vend_id ORDER BY v.vend_id;
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