From 75b6887e81e4868071397df598ed9804fbb6bb70 Mon Sep 17 00:00:00 2001
From: mba1398 <26516464+mba1398@users.noreply.github.com>
Date: Sun, 22 Aug 2021 11:49:12 +0800
Subject: [PATCH] =?UTF-8?q?Update=20ch02:=20=E5=9F=BA=E7=A1=80=E6=9F=A5?=
 =?UTF-8?q?=E8=AF=A2=E4=B8=8E=E6=8E=92=E5=BA=8F.md?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ch02: 基础查询与排序.md | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/ch02: 基础查询与排序.md b/ch02: 基础查询与排序.md
index 1049693..c291bd2 100644
--- a/ch02: 基础查询与排序.md	
+++ b/ch02: 基础查询与排序.md	
@@ -503,6 +503,13 @@ INSERT INTO user(name, date_login) VALUES
 
 ![图片](./img/ch02/ch02.07_null_last2.jpg)   ![图片](./img/ch02/ch02.07_null_last3.jpg)
 
+还可以使用 `COALESCE` 函数
+
+![图片](./img/ch02/ch02.07_null_last4.jpg)
+
+
+
+
 
 
 ##