摘要: 第一种情况:普通情况 第二种情况: 第三种情况: 结果: select t1.Name as Employee,t1.Salary as Salary,t2.Name as Department from Employee t1 left join Department t2 on t1.Depar 阅读全文
posted @ 2017-12-27 14:47 哒哒哒大大诚 阅读(131) 评论(0) 推荐(0) 编辑