摘要：
https://leetcode.com/problems/nth-highest-salary/ATTENTION:limit 子句只能接受int常量,不能接受运算式CREATE FUNCTION getNthHighestSalary(N INT) RETURNS INTBEGINSET N =... 阅读全文
摘要：
https://leetcode.com/problems/second-highest-salary/Write a SQL query to get the second highest salary from theEmployeetable.+----+--------+| Id | Sal... 阅读全文
摘要：
https://leetcode.com/problems/combine-two-tables/Combine Two TablesTable: Person+-------------+---------+| Column Name | Type |+-------------+-----... 阅读全文