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 a.vend_id,COUNT(b.prod_id) FROM Vendors a LEFT JOIN Products b ON a.vend_id=b.vend_id GROUP BY a.vend_id ORDER BY a.vend_id ASC;
列出供应商及其可供产品的数量
http://www.nowcoder.com/practice/17f22851cf204019b51a36761a3afc79
SELECT a.vend_id,COUNT(b.prod_id) FROM Vendors a LEFT JOIN Products b ON a.vend_id=b.vend_id GROUP BY a.vend_id ORDER BY a.vend_id ASC;
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