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摘要: --分组函数 select avg(emp.salary), max(emp.salary), count(emp.salary), count(emp.employeeid), count(*) from employee emp where emp.deptid = '10' --分组数据 部门的工资和 select emp.deptid, sum(emp.salary) ... 阅读全文
posted @ 2018-09-18 15:55 雪人奥特曼 阅读(243) 评论(0) 推荐(0) 编辑