ALTER FUNCTION [dbo].[GetWeekDay] ( @Year INT, @Month INT ,@Day INT ) RETURNS INT AS BEGIN DECLARE @date DATETIME= DATEFROMPARTS(@Year,@Month,@Day); ; --select @@datefirst --SELECT alias, * from master..syslanguages --SELECT DATEPART(WEEKDAY,'2018-11
完成R Programming第三周 这周作业有点绕,更多地是通过一个缓存逆矩阵的案例,向我们示范[词法作用域 Lexical Scopping]的功效.但是作业里给出的函数有点绕口,花费了我们蛮多心思. Lexical Scopping: The value of free variables are searched for in the environment where the function was defined. 因此 make.power<-function(n){ pow<