2021-11-29 SQL学习5

课程资料网盘链接:https://pan.baidu.com/s/1-jOwaXWArtv8h21B0-uWGg 提取码:wsra
SQL零基础入门笔记:https://www.mubucm.com/doc/4VC7JuHlj6H
云端数据库安装文档:https://share.mubu.com/doc/rBUGcUie8H
Python安装文档:https://www.mubucm.com/doc/4DJ8YNSNz4F

HAVING 子句
在 SQL 中增加 HAVING 子句原因是,WHERE 关键字无法与聚合函数一起使用。

HAVING 子句可以让我们筛选分组后的各组数据。

SELECT column_name, aggregate_function(column_name)
FROM table_name
WHERE column_name operator value
GROUP BY column_name
HAVING aggregate_function(column_name) operator value;

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