Just DO IT by luckygxf

摘要： Write a function that takes an unsigned integer and returns the number of ’1' bits it has (also known as theHamming weight).For example, the 32-bit in... 阅读全文

摘要： Table:Person+-------------+---------+| Column Name | Type |+-------------+---------+| PersonId | int || FirstName | varchar || LastName ... 阅读全文

摘要： Write a SQL query to get the second highest salary from theEmployeetable.+----+--------+| Id | Salary |+----+--------+| 1 | 100 || 2 | 200 || ... 阅读全文

摘要： TheEmployeetable holds all employees including their managers. Every employee has an Id, and there is also a column for the manager Id.+----+-------+-... 阅读全文