From d7bb147d7f7fa576e57df63bc737673d5b48edca Mon Sep 17 00:00:00 2001
From: smallkun <smallerkun@foxmail.com>
Date: Fri, 14 Mar 2025 08:46:52 +0800
Subject: [PATCH] Auto commit

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+### 练习一
+
+**1**
+
+```sql
+#(1)创建数据库
+CREATE DATABASE test04_Market DEFAULT CHARACTER SET utf8;
+USE test04_Market;
+#(2)创建数据表
+CREATE TABLE customers(
+	c_num INT(11) PRIMARY KEY	AUTO_INCREMENT,
+	c_name VARCHAR(50),
+	c_contact VARCHAR(50),
+	c_city VARCHAR(50),
+	c_birth DATETIME NOT NULL
+);
+#(3)更改字段的位置
+#AFTER/BEFORE 字段名 设置位置在指定字段前/后
+ALTER TABLE 表名 MODIFY 字段名 数据类型 AFTER/BEFORE 字段名;
+ALTER TABLE customers MODIFY c_contact VARCHAR(50) AFTER c_birth;
+#(4)更改字段的数据类型
+ALTER TABLE customers MODIFY c_name VARCHAR(70);
+#(5)更改字段名
+ALTER TABLE customers CHANGE c_contact c_phone VARCHAR(50);
+#(6)添加字段
+ALTER TABLE customers ADD c_gender CHAR(1);
+#(7)更改表名
+ALTER TABLE customers RENAME TO customers_info;
+#(8)删除字段
+ALTER TABLE customers_info DROP c_city;
+```
+
+**2**
+
+```sql
+```
+