查询当月第一天
SELECT DATE_FORMAT(NOW(), %Y-%m-01) AS first_day_of_month;
SELECT DATE_FORMAT(CURDATE(), %Y-%m-01) AS first_day_of_month;查询当月最后一天
SELECT LAST_DAY(CURRENT_DATE) AS last_day_of_month;;
SELECT LAST_DAY(NOW()) AS last_day_of_month查询当…
一、内部类
1.内部类概述 2.内部类的四种实现形式 1.成员内部类 public class Outer {private int age99;public static String a;//成员内部类public class Inner{private int age88;private String name;
// public static String school; //jdk 16开始才支持定义静态…