苏州建网站收费,制作房地产网站页面,虚拟主机销售网站模板,泉州做网站优化GROUP BY 语句用于结合聚合函数#xff0c;根据一个或多个列对结果集进行分组 GROUP BY 语法 SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name; 例句#xff1a; 每个学生的总分数 select S,su…GROUP BY 语句用于结合聚合函数根据一个或多个列对结果集进行分组 GROUP BY 语法 SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name; 例句 每个学生的总分数 select S,sum(score) sum from sc group by S 多表连接SELECT Websites.name,COUNT(access_log.aid) AS nums FROM access_log
LEFT JOIN Websites
ON access_log.site_idWebsites.id
GROUP BY Websites.name; 转载于:https://www.cnblogs.com/jiablogs/p/8807170.html
