mysql数据库分组查询(group by/ having)

注意： select语句书写规则 S-F-W-G-H-O    select...from....where...group by....having......order by sql语句的写法顺序和mysql对应sql解析顺序不同 解析顺序：1.from 2.where 3.group by 4.select 5.having 6.order by 报错 是因为where在select之前执行

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