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SQL实战19.查找所有员工的last_name和first_name以及对应的dept_name
题目 解答 多表外联结 select e last name e first name de dept name from employees as e left join dept emp as d on e emp no d emp n
SQL刷题
mysql
数据库
牛客SQL大厂面试真题:SQL3 每类视频近一个月的转发量/率
编程代码 select b tag sum a if retweet as retweet cut round sum a if retweet count a id 3 as retweet rate from tb user video
SQL刷题
数据库