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摘要: https://www.jianshu.com/p/d923cf8ae25f 阅读全文
posted @ 2022-04-02 19:05 Zhbeii 阅读(43) 评论(0) 推荐(0)
摘要: select * from( select emp_no,count(distinct salary) as t from salaries group by emp_no ) where t>15 这个语法会报错,在第六行,报错的原因是这个子查询必须要起别名 SQL_ERROR_INFO: 'Ev 阅读全文
posted @ 2022-04-02 17:44 Zhbeii 阅读(292) 评论(0) 推荐(0)