175.【简单】组合两个表select p.FirstName,p.LastName,a.City,a.State from person p left join address a on p.personid=a.personid;176.【简单】第二高的薪水select ifnull((select dist...
//// ViewController.m// paintCodeTestOC//gif// Created by LongMa on 2019/7/25.//#import "ViewController.h"@interface ViewController ()@property (weak...