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+## 第1题
+
+1、创建数据库test01_market
+
+```MySQL
+CREATE DATABASE test01_market;
+```
+
+
+2、创建表格customers
+
+```mysql
+USE test01_market;
+```
+
+
+
+```mysql
+CREATE TABLE customers(
+c_num int(11),
+c_name VARCHAR(50),
+c_conntact VARCHAR(50),
+c_city VARCHAR(50),
+c_birth date
+);
+```
+
+
+
+| 字段名    | 数据类型    |
+| --------- | ----------- |
+| c_num     | int（11）   |
+| c_name    | varchar(50) |
+| c_contact | varchar(50) |
+| c_city    | varchar(50) |
+| c_birth   | date        |
+
+**要求3：**将c_contact字段移动到c_birth字段后面
+
+```mysql
+ALTER TABLE customers MODIFY  c_conntact VARCHAR(50) AFTER c_birth;
+```
+
+
+**要求4：**将c_name字段数据类型改为 varchar(70)
+
+```mysql
+ALTER TABLE customers MODIFY c_name VARCHAR(70);
+```
+
+
+**要求5：**将c_contact字段改名为c_phone
+
+```mysql
+ALTER TABLE customers_into CHANGE c_conntact c_phne VARCHAR(50);
+```
+
+
+**要求6：**增加c_gender字段到c_name后面，数据类型为char(1)
+
+```mysql
+ALTER TABLE customers ADD c_gender CHAR(1) AFTER c_name;
+```
+
+
+**要求7：**将表名改为customers_info
+
+```mysql
+ALTER TABLE customers RENAME TO customers_into;
+```
+
+**要求8：**删除字段c_city
+
+```mysql
+ALTER TABLE customers_into DROP c_city;
+```
+
+## 第2题
+
+1、创建数据库test02_library
+
+```mysql
+CREATE DATABASE test02_library;
+```
+
+
+```mysql
+use test02_library;
+```
+
+2、创建表格books
+
+```mysql
+CREATE TABLE books(
+b_id int(11),
+b_name VARCHAR(50),
+authors VARCHAR(100),
+price FLOAT,
+pubdate YEAR,
+note VARCHAR(100),
+num int(11)
+ );
+```
+
+
+
+| 字段名  | 字段说明 | 数据类型      | 允许为空 | 唯一 |
+| ------- | -------- | ------------- | -------- | ---- |
+| b_id    | 书编号   | int(11)       | 否       | 是   |
+| b_name  | 书名     | varchar（50） | 否       | 否   |
+| authors | 作者     | varchar(100)  | 否       | 否   |
+| price   | 价格     | float         | 否       | 否   |
+| pubdate | 出版日期 | year          | 否       | 否   |
+| note    | 说明     | varchar(100)  | 是       | 否   |
+| num     | 库存     | int(11)       | 否       | 否   |
+
+3、向books表中插入记录
+
+1） 指定所有字段名称插入第一条记录
+
+```mysql
+INSERT INTO books VALUES (1,'Tal of AAA','Dickes',23,1995,'novel',11);
+```
+
+2）不指定字段名称插入第二记录
+
+```mysql
+INSERT INTO books VALUES (2,'Emmat','Jane',23,1993,'joke',22);
+```
+
+3）同时插入多条记录（剩下的所有记录）
+
+```mysql
+INSERT into books VALUES (3,'Story of jane','jane Tim',40,2001,'novel',0),(4,'Lovey Day','George Byron',20,2005,'novel',30),(5,'Old land','Honore Blade',30,2010,'Law',0),(6,'The Battle','Upton Sara',30,1999,'medicine',40),(7,'Rose Hood','Richaard haggard',28,2008,'cartoon',28);
+```
+
+
+
+| b_id | b_name        | authors         | price | pubdate | note     | num  |
+| ---- | ------------- | --------------- | ----- | ------- | -------- | ---- |
+| 1    | Tal of AAA    | Dickes          | 23    | 1995    | novel    | 11   |
+| 2    | EmmaT         | Jane lura       | 35    | 1993    | joke     | 22   |
+| 3    | Story of Jane | Jane Tim        | 40    | 2001    | novel    | 0    |
+| 4    | Lovey Day     | George Byron    | 20    | 2005    | novel    | 30   |
+| 5    | Old land      | Honore Blade    | 30    | 2010    | law      | 0    |
+| 6    | The Battle    | Upton Sara      | 30    | 1999    | medicine | 40   |
+| 7    | Rose Hood     | Richard haggard | 28    | 2008    | cartoon  | 28   |
+
+4、将小说类型(novel)的书的价格都增加5。
+
+```mysql
+UPDATE books set price=price+5 WHERE note='novel';
+```
+
+5、将名称为EmmaT的书的价格改为40。
+
+```mysql
+UPDATE books set price=40 WHERE note='Emmat';
+```
+
+6、删除库存为0的记录
+
+```mysql
+delete from books where num=0;
+```
+