What you do today can improve all your tomorrows.
Bear in mind: S = Single Responsibility Principle
O = Opened Closed Principle
L = Liskov Substitution Principle
I = Interface Segregation Principle
D = Dependency Inversion Principle
摘要：
没有在 group by 出现的基本列，是不能在select 子句中使用，若要使用，就只能作为聚合函数的输入。而 over 子句 就可以决解这一问题,如:select Name, Max(Age) Over() as MaxAge from usersrow_number()从1开始，为每一条分组... 阅读全文
