[LeetCode][Database]题解合集

学完MySql，就兴冲冲跑去做LeetCode上的数据库题，还未做完早已汗颜。题目的众多要求到了自己写的时候，就什么也想不起来，只好上网查各种分析和答案，最终做出来将近一半都是别人的想法。
不过总归是完成了，每道题都在博客里记下了思路和题解，在此立个总集吧。

[LeetCode](按通过率从高到低)

181 Employees Earning More Than Their Managers
182 Duplicate Emails
175 Combine Two Tables
183 Customers Who Never Order
197 Rising Temperature
176 Second Highest Salary
180 Consecutive Numbers
178 Rank Scores
184 Department Highest Salary
196 Delete Duplicate Emails
177 Nth Highest Salary
185 Department Top Three Salaries