本文记录个人刷题记录 推荐两个刷题网站: 地址:https://leetcode.com/ 另外一个地址:http://www.lintcode.com/ 1.Write a SQL query to get the second highest salary from the Employee table. 题目地址:https://leetcode.com/problems/second-highest-salary/ +----+--------+ | Id | Salary | +---…
user_profile表: id device_id gender age university province 1 2138 male 21 北京大学 Beijing 2 3214 male 复旦大学 Shanghai 3 6543 female 20 北京大学 Beijing 4 2315 female 23 浙江大学 ZheJiang 5 5432 male 25 山东大学 Shandong question_pratice_detail表: id device_id questi…