From f04af8ccf0775d36a27ac2f150bbca3eab896039 Mon Sep 17 00:00:00 2001
From: kwongtai <kwongtailau@gmail.com>
Date: Fri, 13 Apr 2018 18:55:05 +0800
Subject: [PATCH 1/2] fix mispell, strongest compulsively

---
 notes/数据库系统原理.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/notes/数据库系统原理.md b/notes/数据库系统原理.md
index 6ebc72a8..3554533a 100644
--- a/notes/数据库系统原理.md
+++ b/notes/数据库系统原理.md
@@ -227,13 +227,13 @@ MySQL 中提供了两种封锁粒度：行级锁以及表级锁。
 事务遵循两段锁协议是保证并发操作可串行化调度的充分条件。例如以下操作满足两段锁协议，它是可串行化调度。
 
 ```html
-lock-x(A)...lock-s(B)...lock-s(c)...unlock(A)...unlock(C)...unlock(B)
+lock-x(A)...lock-s(B)...lock-s(C)...unlock(A)...unlock(C)...unlock(B)
 ```
 
 但不是必要条件，例如以下操作不满足两段锁协议，但是它还是可串行化调度。
 
 ```html
-lock-x(A)...unlock(A)...lock-s(B)...unlock(B)...lock-s(c)...unlock(C)...
+lock-x(A)...unlock(A)...lock-s(B)...unlock(B)...lock-s(C)...unlock(C)...
 ```
 
 # 四、隔离级别
@@ -331,7 +331,7 @@ select * from table ....;
 select * from table where ? lock in share mode;
 select * from table where ? for update;
 insert;
-update ;
+update;
 delete;
 ```
 

From 7f6fefe08255ec4a78cd10d0354969e645782470 Mon Sep 17 00:00:00 2001
From: kwongtai <kwongtailau@gmail.com>
Date: Fri, 13 Apr 2018 20:05:07 +0800
Subject: [PATCH 2/2] fix mispell

---
 notes/SQL.md | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/notes/SQL.md b/notes/SQL.md
index d582dca2..a87cdd7f 100644
--- a/notes/SQL.md
+++ b/notes/SQL.md
@@ -251,7 +251,7 @@ FROM mytable
 |  LOWER() UPPER() |  转换为小写或者大写 |
 | LTRIM() RTIM() | 去除左边或者右边的空格 |
 | LENGTH() | 长度 |
-| SUNDEX() | 转换为语音值 |
+| SOUNDEX() | 转换为语音值 |
 
 其中， **SOUNDEX()**  是将一个字符串转换为描述其语音表示的字母数字模式的算法，它是根据发音而不是字母比较。
 
@@ -347,7 +347,7 @@ GROUP BY col
 ORDER BY num;
 ```
 
-WHERE 过滤行，HAVING 过滤分组。行过滤应当先与分组过滤；
+WHERE 过滤行，HAVING 过滤分组。行过滤应当先于分组过滤；
 
 ```sql
 SELECT col, COUNT(*) AS num
@@ -464,7 +464,7 @@ from employee natural join department;
 ```sql
 select Customers.cust_id, Orders.order_num
 from Customers left outer join Orders
-on Customers.cust_id = Orders.curt_id;
+on Customers.cust_id = Orders.cust_id;
 ```
 
 如果需要统计顾客的订单数，使用聚集函数。
@@ -473,7 +473,7 @@ on Customers.cust_id = Orders.curt_id;
 select Customers.cust_id,
        COUNT(Orders.order_num) as num_ord
 from Customers left outer join Orders
-on Customers.cust_id = Orders.curt_id
+on Customers.cust_id = Orders.cust_id
 group by Customers.cust_id;
 ```