How to solve the education crisis for boys and men Link: https://www.ted.com/talks/richard_reeves_how_to_solve_the_education_crisis_for_boys_and_men
Speaker: Richard Reeves
Date: April 2023 文章目录 How to solve the education crisis for boys and menIntro…
pivot函数:行转列函数: 语法:pivot(任一聚合函数 for 需专列的值所在列名 in (需转为列名的值)); unpivot函数:列转行函数: 语法:unpivot(新增值所在列的列名 for 新增列转为行后所在列…
目录 CarFactory.java
public interface CarFactory {Engine createEngine();Seat createSeat();Tyre createTyre();
}LowCarFactory.java
public class LowCarFactory implements CarFactory{Overridepublic Engine createEngine() {return new LowEngine();}Overridepublic…