Mary is a teacher in a middle school and she has a table seat storing students' names and their corresponding seat ids. The column id is continuous increment. Mary wants to change seats for the adjacent students. Can you write a SQL query to output t…

Mary is a teacher in a middle school and she has a table seat storing students' names and their corresponding seat ids. The column id is continuous increment. Mary wants to change seats for the adjacent students. Can you write a SQL query to output t…

SQL架构 Create table If Not Exists seat(id )) Truncate table seat insert into seat (id, student) values (', 'Abbot') insert into seat (id, student) values (', 'Doris') insert into seat (id, student) values (', 'Emerson') insert into seat (id, student)…

问题表述 数据库表如下: id student 1 Abbot 2 Doris 3 Emerson 4 Green 5 Jeames 现在要通过SQL语句将表变换成如下: id student 1 Doris 2 Abbot 3 Green 4 Emerson 5 Jeames 即id不变,奇数位和偶数位交换位置,如果表的总行数为奇数,则最后一行不变. 问题解决 首先看到这个问题,我就想SQL里面是不是有什么置换函数之类的,结果去查了查,并没有这样的函数.在我尝试了各种select方法后,还是没…

All LeetCode Questions List(Part of Answers, still updating) 题目汇总及部分答案(持续更新中) Leetcode problems classified by company 题目按公司分类(Last updated: October 2, 2017) .   Top Interview Questions # Title Difficulty Acceptance 1 Two Sum Medium 17.70% 2 Add Two N…

175. Combine Two Tables https://leetcode.com/problems/combine-two-tables/description/ Description Person 表: Column Name Type PersonId int FirstName varchar LastName varchar Address 表: Column Name Type AddressId int PersonId int City varchar State var…

请点击页面左上角 -> Fork me on Github 或直接访问本项目Github地址:LeetCode Solution by Swift    说明:题目中含有$符号则为付费题目. 如:[Swift]LeetCode156.二叉树的上下颠倒 $ Binary Tree Upside Down 请下拉滚动条查看最新 Weekly Contest!!! Swift LeetCode 目录 | Catalog 序        号 题名Title 难度     Difficulty  两数之…

[175]Combine Two Tables (2018年11月23日,开始集中review基础) Table: Person +-------------+---------+ | Column Name | Type | +-------------+---------+ | PersonId | int | | FirstName | varchar | | LastName | varchar | +-------------+---------+ PersonId is the pr…

题目链接:https://leetcode-cn.com/problems/exchange-seats/ 题目 小美是一所中学的信息科技老师,她有一张 seat 座位表,平时用来储存学生名字和与他们相对应的座位 id. 其中纵列的 id 是连续递增的 小美想改变相邻俩学生的座位. 你能不能帮她写一个 SQL query 来输出小美想要的结果呢? 示例: +---------+---------+ | id | student | +---------+---------+ | 1 | Abbo…

1. 排序 排序(sort)是一种常见的算法,把数据根据特定的顺序进行排列.经典的排序算法如下: 冒泡排序(bubble sort) 插入排序(insertion sort) 选择排序(selection sort) 快速排序(quick sort) 堆排序(heap sort) 归并排序(merge sort) 冒泡排序依次比较相邻的两个元素,若逆序则交换:如此走访数列重复n次,即不再发生交换,排序完成.(以下图片均来自于Wikipedia) 但是,冒泡排序存在着许多无意义的交换,比如:对于基…