From fd733bdec8a25229afbeb3f09f28b08f1e22276c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=A8=8B=E5=B8=85=E7=BF=94?= <3371439772@qq.com>
Date: Tue, 21 Feb 2023 00:05:52 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E4=B8=80=E6=AC=A1=E4=BD=9C=E4=B8=9A?=
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+## 第一题
+
+
+
+# 1、创建数据库test01_market;
+
+create DATABASE if not exists test01_market;
+#2、创建表格customers
+use  test01_market;
+drop table customers;
+create TABLE customers(
+c_num int(11),
+c_name varchar(50),
+c_contact 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
+
+alter table customers MODIFY c_contact varchar(50) after c_birth;
+#**要求4：**将c_name字段数据类型改为 varchar(70)
+alter TABLE customers modify  c_name varchar(70);
+#**要求5：**将c_contact字段改名为c_phone
+ALTER table customers CHANGE c_contact c_phone VARCHAR(50);
+#****要求6：**增加c_gender字段到c_name后面，数据类型为char(1)
+show tables from test01_market;
+alter table customers add c_gender char(1);
+alter table customers MODIFY c_gender char(1) after c_name;
+#**要求7：**将表名改为customers_info
+alter table customers rename customers_info;
+#**删除字段c_city
+alter table customers_info drop c_city;
\ No newline at end of file
-- 
Gitee