task #176

README.md

@@ -40,6 +40,8 @@ Have a good contributing!
     - [511. Game Play Analysis 1](./leetcode/easy/511.%20Game%20Play%20Analysis%201.sql)
     - [577. Employee Bonus](./leetcode/easy/577.%20Employee%20Bonus.sql)
     - [595. Big Countries](./leetcode/easy/595.%20Big%20Countries.sql)
+2. [Medium](./leetcode/medium/)
+    - [176. Second Highest Salary](./leetcode/medium/176.%20Second%20Highest%20Salary.sql)
 
 ## License
 

leetcode/medium/176. Second Highest Salary.sql

@@ -0,0 +1,19 @@
+/*
+Table: Employee
+
++-------------+------+
+| Column Name | Type |
++-------------+------+
+| id          | int  |
+| salary      | int  |
++-------------+------+
+id is the primary key (column with unique values) for this table.
+Each row of this table contains information about the salary of an employee.
+
+
+Write a solution to find the second highest distinct salary from the Employee table. If there is no second highest salary, return null (return None in Pandas)
+*/
+
+SELECT MAX(e1.salary) AS SecondHighestSalary
+FROM Employee AS e1
+WHERE e1.salary < (SELECT MAX(e2.salary) FROM Employee AS e2)