Update and rename 0183. Customers Who Never Order.sql to 0183.(Easy) …

…Customers Who Never Order.sql

Database/0183. Customers Who Never Order.sql → Database/0183.(Easy) Customers Who Never Order.sql

@@ -1,10 +1,24 @@
 /****************************************
 183. Customers Who Never Order
+183. 从不订购的客户
 
 Difficulty: Easy
 
 Suppose that a website contains two tables, the Customers table and the Orders table. 
 Write a SQL query to find all customers who never order anything.
+某网站包含两个表，Customers 表和 Orders 表。编写一个 SQL 查询，找出所有从不订购任何东西的客户。
+
+SQL Schema:
+Create table If Not Exists Customers (Id int, Name varchar(255))
+Create table If Not Exists Orders (Id int, CustomerId int)
+Truncate table Customers
+insert into Customers (Id, Name) values ('1', 'Joe')
+insert into Customers (Id, Name) values ('2', 'Henry')
+insert into Customers (Id, Name) values ('3', 'Sam')
+insert into Customers (Id, Name) values ('4', 'Max')
+Truncate table Orders
+insert into Orders (Id, CustomerId) values ('1', '3')
+insert into Orders (Id, CustomerId) values ('2', '1')
 
 Table: Customers.
 +----+-------+
@@ -25,6 +39,7 @@ Table: Orders.
 +----+------------+
 
 Using the above tables as example, return the following:
+例如给定上述表格，你的查询应返回：
 +-----------+
 | Customers |
 +-----------+
@@ -50,3 +65,4 @@ WHERE Customers.Id NOT IN (
     FROM Orders
 )
 
+