From 8f66701d915fdb3a2938eb72d1b15d2fb50f0fc4 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E9=97=AB=E7=BB=A7=E5=91=A8?= Date: Tue, 21 Feb 2023 00:15:34 +0800 Subject: [PATCH] =?UTF-8?q?=E6=88=91=E7=9A=84MySQL=E7=AC=AC=E4=B8=80?= =?UTF-8?q?=E6=AC=A1=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...56\345\272\223\350\241\250\346\240\274.md" | 34 +++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 "33\351\227\253\347\273\247\345\221\250/20230220\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223\350\241\250\346\240\274.md" diff --git "a/33\351\227\253\347\273\247\345\221\250/20230220\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223\350\241\250\346\240\274.md" "b/33\351\227\253\347\273\247\345\221\250/20230220\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223\350\241\250\346\240\274.md" new file mode 100644 index 0000000..3960532 --- /dev/null +++ "b/33\351\227\253\347\273\247\345\221\250/20230220\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223\350\241\250\346\240\274.md" @@ -0,0 +1,34 @@ +```mysql +-- 1、创建数据库test01_market +CREATE DATABASE test01_market; +-- 2、创建表格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); +DESC customers; +-- **要求5：**将c_contact字段改名为c_phone +ALTER TABLE customer 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) +ALTER TABLE customers ADD c_gender CHAR(1)AFTER c_name; +-- **要求7：**将表名改为customers_info +ALTER TABLE customers RENAME TO customers_info; +-- **要求8：**删除字段c_city +ALTER TABLE customers_info DROP c_city; +``` + -- Gitee