SQL必知必会笔记8分组数据
2020-11-09
来源：华佗健康网
1. 使用GROUP BY子句创建分组 示例: SELECT vend_id, COUNT ( * ) AS num_prods FROM Products GROUP BY vend_id;
1. 使用GROUP BY子句创建分组
示例:
SELECT vend_id, COUNT(*) AS num_prods FROM Products GROUP BY vend_id; ，网站空间，香港空间，网站空间
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