From fef4b760bdae908e0e678dc31c02ae356b6e65e7 Mon Sep 17 00:00:00 2001
From: YangFong <yangfong2022@qq.com>
Date: Tue, 15 Mar 2022 09:33:12 +0800
Subject: [PATCH] docs: add a description of the solution to lc problem:
 No.0183

No.0183.Customers Who Never Order
---
 .../0100-0199/0183.Customers Who Never Order/README.md    | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/solution/0100-0199/0183.Customers Who Never Order/README.md b/solution/0100-0199/0183.Customers Who Never Order/README.md
index ce26b6a114b47..d1c90c1c69f38 100644
--- a/solution/0100-0199/0183.Customers Who Never Order/README.md	
+++ b/solution/0100-0199/0183.Customers Who Never Order/README.md	
@@ -44,6 +44,14 @@
 
 <!-- 这里可写通用的实现逻辑 -->
 
+**方法一：**
+
+列举所有已存在订单的客户 ID，使用 `NOT IN` 找到不存在其中的客户。
+
+**方法二：**
+
+使用 `LEFT JOIN` 连接表格，返回 `CustomerId` 为 `NULL` 的数据。
+
 <!-- tabs:start -->
 
 ### **SQL**