【leetcode】SQL相关的题目

最近在学MYSQL，慢慢更新吧

推荐好书：SQL必知必会。靠这本书入了个门

以下均为MYSQL方式提交

Duplicate Emails

select Email from Person
group by email
having count(*) >1

Employees Earning More Than Their Managers

select E1.name as Employee
from Employee as E1,Employee as E2
where E1.ManagerID=E2.Id and E1.Salary>E2.Salary

Combine Two Tables

select FirstName,LastName,City,State from Person
left join Address on Person.PersonId=Address.PersonId;

Customers Who Never Order

select name as Customers from Customers C
where C.Id not in (select CustomerID from Orders);