墨染百城

问题连接：https://leetcode.com/problems/combine-two-tables/#/description问题描述Table: Person+-------------+---------+| Column Name | Type |+-------------+---------+| PersonId | int || FirstName

准备数据建表语句CREATE TABLE students(sno VARCHAR(3) NOT NULL, sname VARCHAR(4) NOT NULL,ssex VARCHAR(2) NOT NULL, sbirthday DATETIME,class VARCHAR(5))CREATE TABLE courses(cno VARCHAR(5) NOT NULL, cname