From 7e5912db8b569969ab49e92d134d9c5ff4532d33 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E6=9D=A8=E6=97=AD=E4=B8=9C?= <1875779940@qq.com> Date: Tue, 21 Feb 2023 22:31:22 +0800 Subject: [PATCH] =?UTF-8?q?=E6=9D=A8=E6=97=AD=E4=B8=9C=E7=9A=84=E4=BD=9C?= =?UTF-8?q?=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...0\346\215\256\345\272\223test01_market.md" | 31 ++ ...6\215\256\345\272\223test02_library(1).md" | 49 ++++ ...46\215\256\345\272\223test03_bookstore.md" | 123 ++++++++ ...72\345\272\223\345\273\272\350\241\250.md" | 35 +++ .../20230221 \347\272\246\346\235\237.md" | 269 ++++++++++++++++++ .../20230221DDL\345\222\214DML.md" | 226 +++++++++++++++ 6 files changed, 733 insertions(+) create mode 100644 "55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test01_market.md" create mode 100644 "55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test02_library(1).md" create mode 100644 "55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test03_bookstore.md" create mode 100644 "55 \346\235\250\346\227\255\344\270\234/20230221 \345\273\272\345\272\223\345\273\272\350\241\250.md" create mode 100644 "55 \346\235\250\346\227\255\344\270\234/20230221 \347\272\246\346\235\237.md" create mode 100644 "55 \346\235\250\346\227\255\344\270\234/20230221DDL\345\222\214DML.md" diff --git "a/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test01_market.md" "b/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test01_market.md" new file mode 100644 index 0000000..60bbbc1 --- /dev/null +++ "b/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test01_market.md" @@ -0,0 +1,31 @@ +#1、创建数据库test01_market +CREATE database test01_market; +use test01_market; +#2、创建表格customers +#| 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 | +CREATE TABLE customers( +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) +ALTER TABLE customers ADD COLUMN 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 TO customers_info; +#要求8：删除字段c_city +ALTER TABLE customers_info DROP COLUMN c_city; \ No newline at end of file diff --git "a/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test02_library(1).md" "b/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test02_library(1).md" new file mode 100644 index 0000000..fdf1167 --- /dev/null +++ "b/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test02_library(1).md" @@ -0,0 +1,49 @@ +#1、创建数据库test02_library +CREATE DATABASE test02_library; +USE test02_library; +#2、创建表格books +CREATE TABLE books( +b_id int(11) not null , +b_name VARCHAR(50) NOT NULL, +`authors` VARCHAR(100) NOT NULL, +price FLOAT NOT null , +pubdate year NOT NULL, +note varchar(100) , +num int(11) not NULL +); +DESC books; +#| 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 +INSERT INTO books (b_id,b_name,`authors`,price,pubdate,note,num) VALUES (1,'Tal of AAA','Dickes',23,'1995','novel',11); +SELECT*FROM books; +#2）不指定字段名称插入第二记录 +INSERT INTO books VALUES(2,'EmmaT','Jane lura',35,'1993','joke',22); +#3）同时插入多条记录（剩下的所有记录） +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 Byron',20,'2010','law',0),(6,'The Battle','Upton Sara',30,'1999','medicine',40),(7,'Rose Hood','Richard haggard',28,'2008','cartoon',28); +SELECT*FROM books; +#| 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。 +UPDATE books set price =price+5 WHERE note='novel'; +#5、将名称为EmmaT的书的价格改为40。 +UPDATE books set price=40 WHERE b_name='EmmaT'; +#6、删除库存为0的记录 +DELETE from books where num=0; +SELECT*FROM books; \ No newline at end of file diff --git "a/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test03_bookstore.md" "b/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test03_bookstore.md" new file mode 100644 index 0000000..d957f1a --- /dev/null +++ "b/55 \346\235\250\346\227\255\344\270\234/#1\343\200\201\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223test03_bookstore.md" @@ -0,0 +1,123 @@ +#1、创建数据库test03_bookstore +CREATE DATABASE test03_booksore; +USE test03_booksore; +#2、创建book表 +#+----------+--------------+------+-----+---------+----------------+ +#| Field | Type | Null | Key | Default | Extra | +#+----------+--------------+------+-----+---------+----------------+ +#| id | int(11) | NO | PRI | NULL | auto_increment | +#| title | varchar(100) | NO | | NULL | | +#| author | varchar(100) | NO | | NULL | | +#| price | double(11,2) | NO | | NULL | | +#| sales | int(11) | NO | | NULL | | +#| stock | int(11) | NO | | NULL | | +#| img_path | varchar(100) | NO | | NULL | | +#+----------+--------------+------+-----+---------+----------------+ +CREATE TABLE book( +id int(11) UNSIGNED auto_increment PRIMARY KEY not null, +title VARCHAR(100) NOT NULL, +`authors` VARCHAR(100) NOT NULL, +price double(11,2) NOT NULL, +sales INT(11) NOT NULL, +stock INT(11) NOT NULL, +img_path VARCHAR(100) NOT null +); +DESC book; +#尝试添加部分模拟数据，参考示例如下： +#```mysql +#+----+-------------+------------+-------+-------+-------+----------------------------+ +#| id | title | author | price | sales | stock | img_path | +#+----+-------------+------------+-------+-------+-------+-----------------------------+ +#| 1 | 解忧杂货店 | 东野圭吾 | 27.20 | 102 | 98 | upload/books/解忧杂货店.jpg | +#| 2 | 边城 | 沈从文 | 23.00 | 102 | 98 | upload/books/边城.jpg | +#+----+---------------+------------+-------+-------+-------+----------------------------+ +INSERT INTO book VALUES(1,'解忧杂货店','东野吾圭',27.20,102,98,'upload/books/解忧杂货店.jpg'),(2,'边城','沈从文',23.00,102,98,'upload/books/边城.jpg'); +SELECT*FROM book; + +#3、创建用户表users，并插入数据 +#+----------+--------------+------+-----+---------+----------------+ +#| Field | Type | Null | Key | Default | Extra | +#+----------+--------------+------+-----+---------+----------------+ +#| id | int(11) | NO | PRI | NULL | auto_increment | +#| username | varchar(100) | NO | UNI | NULL | | +#| password | varchar(100) | NO | | NULL | | +#| email | varchar(100) | YES | | NULL | | +#+----------+--------------+------+-----+---------+----------------+ +CREATE TABLE users( +id INT(11) UNSIGNED auto_increment PRIMARY key NOT null, +usersname VARCHAR(100) UNIQUE KEY NOT NULL, +`password` VARCHAR(100) NOT null, +email VARCHAR(100) NULL +); +DESC users; +#尝试添加部分模拟数据，参考示例如下： +#+----+----------+----------------------------------+--------------------+ +#| id | username | password | email | +#+----+----------+----------------------------------+--------------------+ +#| 1 | admin | 112233 | admin@mxdx.com | +#+----+----------+----------------------------------+--------------------+ +INSERT INTO users VALUES(1,'admin',112233,'admin@mxdx.com'); +SELECT*FROM users; + +#4、创建订单表orders +#+--------------+--------------+------+-----+---------+-------+ +#| Field | Type | Null | Key | Default | Extra | +#+--------------+--------------+------+-----+---------+-------+ +#| id | varchar(100) | NO | PRI | NULL | | +#| order_time | datetime | NO | | NULL | | +#| total_count | int(11) | NO | | NULL | | +#| total_amount | double(11,2) | NO | | NULL | | +#| state | int(11) | NO | | NULL | | +#| user_id | int(11) | NO | MUL | NULL | | +#+--------------+--------------+------+-----+---------+-------+ +CREATE TABLE orders( +id VARCHAR(100) PRIMARY KEY NOT NULL, +order_time DATETIME NOT NULL, +total_count INT(11) NOT NULL, +total_amount DOUBLE(11,2) NOT NULL, +state INT(11) NOT NULL, +user_id INT(11) not null +); +DESC orders; +#尝试添加部分模拟数据，参考示例如下： +#+----------------+---------------------+-------------+--------------+-------+---------+ +#| id | order_time | total_count | total_amount | state | user_id | +#+----------------+---------------------+-------------+--------------+-------+---------+ +#| 15294258455691 | 2018-06-20 00:30:45 | 2 | 50.20 | 0 | 1 | +#+----------------+---------------------+-------------+--------------+-------+----- +INSERT INTO orders VALUES(152942258455691,'2018-06-20 00:30:45',2,50.20,0,1); +SELECT*FROM orders; + +#5、创建订单明细表order_items +#+----------+--------------+------+-----+---------+----------------+ +#| Field | Type | Null | Key | Default | Extra | +#+----------+--------------+------+-----+---------+----------------+ +#| id | int(11) | NO | PRI | NULL | auto_increment | +#| count | int(11) | NO | | NULL | | +#| amount | double(11,2) | NO | | NULL | | +#| title | varchar(100) | NO | | NULL | | +#| author | varchar(100) | NO | | NULL | | +#| price | double(11,2) | NO | | NULL | | +#| img_path | varchar(100) | NO | | NULL | | +#| order_id | varchar(100) | NO | MUL | NULL | | +#+----------+--------------+------+-----+---------+----------------+ +CREATE TABLE order_items( +id INT(11) UNSIGNED auto_increment PRIMARY key NOT null, +count INT(11) NOT NULL, +amount DOUBLE(11,2) NOT NULL, +title VARCHAR(100) NOT NULL, +`author` varchar(100) NOT NULL, +price DOUBLE(11,2) NOT NULL, +img_path VARCHAR(100) NOT NULL, +order_id VARCHAR(100) NOT NULL +); +DESC order_items; +#尝试添加部分模拟数据，参考示例如下： +#+----+-------+--------+---------+---------+-------+----------------+----------------+ +#| id |count| amount| title | author | price | img_path | order_id | +#+----+-------+--------+------------+----------+-------+----------------+----------------+ +#| 1 | 1 | 27.20| 解忧杂货店 | 东野圭吾 | 27.20 | static/img/default.jpg|15294258455691 | +#| 2 | 1 | 23.00| 边城 | 沈从文 | 23.00 | static/img/default.jpg|15294258455691 | +#+----+-------+--------+------------+----------+-------+------------+----------------+ +INSERT INTO order_items VALUES(1,1,27.20,'解忧杂货店','东野圭吾',27.20,'static/img/default.jpg',15294258455691),(2,1,23.00,'边城','沈从文',23.00,'static/img/default.jpg',15294258455691); +SELECT*FROM order_items; \ No newline at end of file diff --git "a/55 \346\235\250\346\227\255\344\270\234/20230221 \345\273\272\345\272\223\345\273\272\350\241\250.md" "b/55 \346\235\250\346\227\255\344\270\234/20230221 \345\273\272\345\272\223\345\273\272\350\241\250.md" new file mode 100644 index 0000000..cfdd8c8 --- /dev/null +++ "b/55 \346\235\250\346\227\255\344\270\234/20230221 \345\273\272\345\272\223\345\273\272\350\241\250.md" @@ -0,0 +1,35 @@ +```mysql +笔记 + +DATABASE 数据库 +#创建数据库 +show database 数据库名字 +使用数据库 +use 数据库 +插入数据到表中 +insert into 表名字 values（） +``` + +```mysql +作业 + +SHOW DATABASES; +CREATE DATABASE class;#创建数据库 +use class;#使用数据库 +#创建表单 +CREATE TABLE student( +student_学号 VARCHAR(12), +student_姓名 VARCHAR(4), +student_性别 VARCHAR(2), +student_爱好 VARCHAR(10), +student_住址 VARCHAR(15), +student_电话 VARCHAR(15), +student_邮箱 VARCHAR(20), +student_QQ VARCHAR(15) +); +DESC student;#查询表单结构 +#插入数据 +INSERT into student VALUES('2244310155','杨旭东','男','打游戏,羽毛球','江贵州省贵阳市白云区','18275209683','1875779940@qq.com','1875779940') + +``` + diff --git "a/55 \346\235\250\346\227\255\344\270\234/20230221 \347\272\246\346\235\237.md" "b/55 \346\235\250\346\227\255\344\270\234/20230221 \347\272\246\346\235\237.md" new file mode 100644 index 0000000..8de5b0b --- /dev/null +++ "b/55 \346\235\250\346\227\255\344\270\234/20230221 \347\272\246\346\235\237.md" @@ -0,0 +1,269 @@ +笔记 + +```mysql + + +添加外键 +表内 +create table 表名（。。。。。 {constraint}{外键名称}foreign key{外键名字段}references 主表（主表字段名） ） +表外 +alter table 表名 add constraint 外键名 foreign key （外键名字）references 主表（字段） +删除外键 +alter table drop foreign key 外键名 +设置外键属性 +alter table 表单 add constraint 外键名称 foreign key （外键字段）references on update cascade on delete cascade + +primary key 主键唯一约束且不为空 + +not null 为空 + +default 设置默认值 + +unique 唯一 +``` + +作业 + +```mysql +#1、创建数据库test01_company +create database test01_company; +alter database test01_company charset utf8; +use test01_company; +#2、创建表格offices +#| 字段名 | 数据类型 | +#| ---------- | ----------- | +#| officeCode | int | +#| city | varchar(30) | +#| address | varchar(50) | +#| country | varchar(50) | +#| postalCode | varchar(25) | +create table offices( +officeCode int, +city varchar(50), +address varchar(50), +country varchar(50), +postalCode varchar(25) +); +desc offices; +select*from offices; + +#3、创建表格employees +#| 字段名 | 数据类型 | +#| --------- | ------------- | +#| empNum | int(11) | +#| lastName | varchar（50） | +#| firstName | varchar(50) | +#| mobile | varchar(25) | +#| code | int | +#| jobTitle | varchar(50) | +#| birth | date | +#| Note | varchar(255) |l +#| Sex | varchar(5) | +create table employees( +empNum int(11), +lastNum varchar(50), +firstName varchar(50), +mobile varchar(25), +`code` int, +jobTitle varchar(50), +birth date, +Note varchar(255), +Sex varchar(5) +); +desc employees; +select*from employees; +#要求4：将表employees的mobile字段修改到code字段后面。 +alter table employees modify mobile varchar(25) after code; +#要求5：将表employees的birth字段改名为birthday; +alter table employees change birth birthday date; +#要求6：修改sex字段，数据类型为char（1） +alter table employees modify Sex char(1); +#要求7：删除字段note； +alter table employees drop Note; +#要求8：增加字段名favoriate_activity，数据类型为varchar（100）； +alter table employees add favoriate_activity varchar(100); +#要求9：将表employees的名称修改为 employees_in +alter table employees rename employees_info; + +#1、创建数据库test02db +create database test02db; +alter database test02db charset utf8; +use test02db; +#2、创建表格pet +#| 字段名 | 字段说明 | 数据类型 | +#| ------- | -------- | ----------- | +#| name | 宠物名称 | varchar(20) | +#| owner | 宠物主人 | varchar(20) | +#| species | 种类 | varchar(20) | +#| sex | 性别 | char(1) | +#| birth | 出生日期 | year | +#| death | 死亡日期 | year | +create table pet( +name varchar(20), +`owner` varchar(20), +species varchar(20), +sex char(1), +birth year, +death year +); +#3、添加记录 +#| name | owner | species | sex | birth | death | +#| ------ | ------ | ------- | ---- | ----- | ----- | +#| Fluffy | harold | Cat | f | 2003 | 2010 | +#| Claws | gwen | Cat | m | 2004 | | +#| Buffy | | Dog | f | 2009 | | +#| Fang | benny | Dog | m | 2000 | | +#| bowser | diane | Dog | m | 2003 | 2009 | +#| Chirpy | | Bird | f | 2008 | | +insert into pet values +('Fluffy', 'harold','Cat','f','2003','2010'), +('Claws','gwen','Cat','m','2004',null), +('Buffy',null, 'Dog','f','2009',null), +('Fang','benny','Dog','m','2000',null), +('bowser','diane','Dog','m','2003','2009'), +('Chitpy',null,'Bird','f','2008',null); +desc pet; +select*from pet; +#4、 添加字段主人的生日owner_birth。 +alter table pet add owner_birth year; +#5、 将名称为Claws的猫的主人改为kevin +update pet set name='kevin' where name='Claws'; +#6、 将没有死的狗的主人改为duck +update pet set `owner`='duck' where species='Dog'and death is null; +#7、 查询没有主人的宠物的名字； +select name from pet where owner is null; +#8、 查询已经死了的cat的姓名，主人，以及去世时间； +select*from pet where death is not null; +#9、 删除已经死亡的狗 +delete from pet where death='2009'; +#10、查询所有宠物信息 +select*from pet; + +#1、创建数据库：test03_company +create database test03_company; +alter database test03_company charset utf8; +use test03_company; +#2、在此数据库下创建如下3表，数据类型，宽度，是否为空根据实际情况自己定义。 +#A.部门表（department）：部门编号（depid），部门名称（depname），部门简介（deinfo）；其中部门编号为主键。 +create table department( + depid int primary key auto_increment, + depname char(10) not null unique key, + deinfo varchar(200) +); +#| 部门编号 | 部门名称 | 部门简介 | +#| -------- | -------- | ------------ | +#| 111 | 生产部 | Null | +#| 222 | 销售部 | Null | +#| 333 | 人事部 | 人力资源管理 | +insert into department values(111,'生产部',null),(222,'销售部',null),(333,'人事部','人力资源部'); +#B． 雇员表（employee）：雇员编号（empid），姓名（name），性别（sex），职称（title），出生日期（birthday），所在部门编号（depid）；其中 +#*​雇员编号为主键； +#*部门编号为外键，外键约束等级为（on update cascade 和on delete set null）； +#*性别默认为男； +create table employee( +empid int primary key auto_increment, +name varchar(10) not null, +sex enum('男','女') not null default '男', +title varchar(10), +birthday date, +depid int +); + #雇员表： +#| 雇员编号 | 姓名 | 性别 | 职称 | 出生日期 | 所在部门编号 | +#| -------- | ---- | ---- | ---------- | ---------- | ------------ | +#| 1001 | 张三 | 男 | 高级工程师 | 1975-1-1 | 111 | +#| 1002 | 李四 | 女 | 助工 | 1985-1-1 | 111 | +#| 1003 | 王五 | 男 | 工程师 | 1978-11-11 | 222 | +#| 1004 | 张六 | 男 | 工程师 | 1999-1-1 | 222 | +insert into employee values +(1001,'张三','男','高级工程师','1975-1-1',111), +(1002,'李四','女','助工','1985-1-1',111), +(1003,'王五','男','工程师','1978-11-11',222), +(1004,'张六','男','工程师','1999-1-1',222); +alter table employee add constraint kf_employee_depid foreign key (depid) references department(depid) on update cascade on delete cascade; +#C工资表（salary）：雇员编号（empid），基本工资（basesalary），职务工资（titlesalary），扣除（deduction）。其中雇员编号为主键。 +#3、给工资表（salary）的雇员编号（empid）增加外键约束，外键约束等级为（on update cascade 和on delete cascade） +#| empid |basesalary|titlesarlary| deduction | +#| -------- | -------- | -------- | ---- | +#| 1001 | 2200 | 1100 | 200 | +#| 1002 | 1200 | 200 | NULL | +#| 1003 | 2900 | 700 | 200 | +#| 1004 | 1950 | 700 | 150 | +create table salary( +empid int primary key auto_increment, +basesalary int, +titlesalary int, +deduction int +); +insert into salary values +(1001,2200,1100,200), +(1002,1200,200,null), +(1003,2900,700,200), +(1004,1950,700,150); +desc salary; +select*from salary; +alter table employee add constraint kf_salary_empid foreign key(empid) references salary(empid) on update cascade on delete cascade; + +#1、创建一个数据库：test04_school +create database test04_school; +alter database test04_school charset utf8; +use test04_school; +#2、创建如下表格 +#表1 Department表的定义 +#| **字段名** | **字段描述** | **数据类型** | **主键** | **外键** | **非空** | **唯一** | +#| ---------- | ------------ | ------------ | -------- | -------- | -------- | -------- | +#| DepNo | 部门号 | int(10) | 是 | 否 | 是 | 是 | +#| DepName | 部门名称 | varchar(20) | 否 | 否 | 是 | 否 | +#| DepNote | 部门备注 | Varchar(50) | 否 | 否 | 否 | 否 | +create table Deparment( +DepNo int(10) primary key not null, +DepName varchar(20) not null, +DepNote varchar(20) +); +#3、添加记录 +#| **DepNo** | **DepName** | **DepNote** | +#| --------- | ----------- | ------------------ | +#| 601 | 软件技术系 | 软件技术等专业 | +#| 602 | 网络技术系 | 多媒体技术等专业 | +#| 603 | 艺术设计系 | 广告艺术设计等专业 | +#| 604 | 管理工程系 | 连锁经营管理等专业 | +insert into Deparment values(601,'软件技术系','软件技术等专业'), +(602,'网络技术系','多媒体技术等专业'), +(603,'艺术设计系','广告艺术设计等专业'), +(604,'管理工程系','连锁经营管理等专业'); +#表2 Teacher表的定义 +#| **字段名** | **字段描述** | **数据类型** | **主键** | **外键** | **非空** | **唯一** | +#| ---------- | ------------ | ------------ | -------- | -------- | -------- | -------- | +#| Number | 教工号 | int | 是 | 否 | 是 | 是 | +#| Name | 姓名 | varchar(30) | 否 | 否 | 是 | 否 | +#| Sex | 性别 | varchar(4) | 否 | 否 | 否 | 否 | +#| Birth | 出生日期 | date | 否 | 否 | 否 | 否 | +#| DepNo | 部门号 | int | 否 | 是 | 否 | 否 | +#| Salary | 工资 | float | 否 | 否 | 否 | 否 | +#| Address | 家庭住址 | varchar(100) | 否 | 否 | 否 | 否 | +create table Teacher( +Number int primary key, +Name varchar(30) not null, +Sex varchar(4), +Birth date, +DepNo int, +Salary float, +Address varchar(100) +); +#| **Number** | **Name** | **Sex** | **Birth** | **DepNo** | **Salary** | **Address** | +#| ---------- | -------- | ------- | ---------- | --------- | ---------- | ------------ | +#| 2001 | Tom | 女 | 1970-01-10 | 602 | 4500 | 四川省绵阳市 | +#| 2002 | Lucy | 男 | 1983-12-18 | 601 | 2500 | 北京市昌平区 | +#| 2003 | Mike | 男 | 1990-06-01 | 604 | 1500 | 重庆市渝中区 | +#| 2004 | James | 女 | 1980-10-20 | 602 | 3500 | 四川省成都市 | +#| 2005 | Jack | 男 | 1975-05-30 | 603 | 1200 | 重庆市南岸区 | +insert into Teacher values(2001,'Tom','女','1970-01-10',602,4500,'四川省绵阳市'), +(2002,'Lucy','男','1983-12-18',601,2500,'北京市昌平区'), +(2003,'Mike','男','1990-06-01',604,1500,'重庆市渝中区'), +(2004,'James','女','1980-10-20',602,3500,'四川省成都市'), +(2005,'Jack','男','1975-05-30',603,1200,'重庆市南岸区'); +#4、用SELECT语句查询Teacher表的所有记录。 +alter table Teacher add constraint ky_teacher_depno foreign key (DepNo) references Deparment(DepNo) on update cascade on delete cascade; +select*from Teacher; +``` + diff --git "a/55 \346\235\250\346\227\255\344\270\234/20230221DDL\345\222\214DML.md" "b/55 \346\235\250\346\227\255\344\270\234/20230221DDL\345\222\214DML.md" new file mode 100644 index 0000000..952a0b6 --- /dev/null +++ "b/55 \346\235\250\346\227\255\344\270\234/20230221DDL\345\222\214DML.md" @@ -0,0 +1,226 @@ +笔记 + +```mysql +#修改字段位置 +alter table 表名 modify 字段名 数据类型 after 字段； +#修改字段数据类型 +alter table 表名 modify 字段名 新数据类型； +#修改表名 +alter table 表名 rename 新表名 +#删除字段 +alter table 表名 drop column 字段名 +#增加字段 +alter table 表名 add column 字段 数据类型 + +``` + +作业 + +```mysql +#1、创建数据库test01_market +CREATE database test01_market; +use test01_market; +#2、创建表格customers +#| 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 | +CREATE TABLE customers( +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) +ALTER TABLE customers ADD COLUMN 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 TO customers_info; +#要求8：删除字段c_city +ALTER TABLE customers_info DROP COLUMN c_city; + +#1、创建数据库test02_library +CREATE DATABASE test02_library; +USE test02_library; +#2、创建表格books +CREATE TABLE books( +b_id int(11) not null , +b_name VARCHAR(50) NOT NULL, +`authors` VARCHAR(100) NOT NULL, +price FLOAT NOT null , +pubdate year NOT NULL, +note varchar(100) , +num int(11) not NULL +); +DESC books; +#| 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 +INSERT INTO books (b_id,b_name,`authors`,price,pubdate,note,num) VALUES (1,'Tal of AAA','Dickes',23,'1995','novel',11); +SELECT*FROM books; +#2）不指定字段名称插入第二记录 +INSERT INTO books VALUES(2,'EmmaT','Jane lura',35,'1993','joke',22); +#3）同时插入多条记录（剩下的所有记录） +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 Byron',20,'2010','law',0),(6,'The Battle','Upton Sara',30,'1999','medicine',40),(7,'Rose Hood','Richard haggard',28,'2008','cartoon',28); +SELECT*FROM books; +#| 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。 +UPDATE books set price =price+5 WHERE note='novel'; +#5、将名称为EmmaT的书的价格改为40。 +UPDATE books set price=40 WHERE b_name='EmmaT'; +#6、删除库存为0的记录 +DELETE from books where num=0; +SELECT*FROM books; + +#1、创建数据库test03_bookstore +CREATE DATABASE test03_booksore; +USE test03_booksore; +#2、创建book表 +#+----------+--------------+------+-----+---------+----------------+ +#| Field | Type | Null | Key | Default | Extra | +#+----------+--------------+------+-----+---------+----------------+ +#| id | int(11) | NO | PRI | NULL | auto_increment | +#| title | varchar(100) | NO | | NULL | | +#| author | varchar(100) | NO | | NULL | | +#| price | double(11,2) | NO | | NULL | | +#| sales | int(11) | NO | | NULL | | +#| stock | int(11) | NO | | NULL | | +#| img_path | varchar(100) | NO | | NULL | | +#+----------+--------------+------+-----+---------+----------------+ +CREATE TABLE book( +id int(11) UNSIGNED auto_increment PRIMARY KEY not null, +title VARCHAR(100) NOT NULL, +`authors` VARCHAR(100) NOT NULL, +price double(11,2) NOT NULL, +sales INT(11) NOT NULL, +stock INT(11) NOT NULL, +img_path VARCHAR(100) NOT null +); +DESC book; +#尝试添加部分模拟数据，参考示例如下： +#```mysql +#+----+-------------+------------+-------+-------+-------+----------------------------+ +#| id | title | author | price | sales | stock | img_path | +#+----+-------------+------------+-------+-------+-------+-----------------------------+ +#| 1 | 解忧杂货店 | 东野圭吾 | 27.20 | 102 | 98 | upload/books/解忧杂货店.jpg | +#| 2 | 边城 | 沈从文 | 23.00 | 102 | 98 | upload/books/边城.jpg | +#+----+---------------+------------+-------+-------+-------+----------------------------+ +INSERT INTO book VALUES(1,'解忧杂货店','东野吾圭',27.20,102,98,'upload/books/解忧杂货店.jpg'),(2,'边城','沈从文',23.00,102,98,'upload/books/边城.jpg'); +SELECT*FROM book; + +#3、创建用户表users，并插入数据 +#+----------+--------------+------+-----+---------+----------------+ +#| Field | Type | Null | Key | Default | Extra | +#+----------+--------------+------+-----+---------+----------------+ +#| id | int(11) | NO | PRI | NULL | auto_increment | +#| username | varchar(100) | NO | UNI | NULL | | +#| password | varchar(100) | NO | | NULL | | +#| email | varchar(100) | YES | | NULL | | +#+----------+--------------+------+-----+---------+----------------+ +CREATE TABLE users( +id INT(11) UNSIGNED auto_increment PRIMARY key NOT null, +usersname VARCHAR(100) UNIQUE KEY NOT NULL, +`password` VARCHAR(100) NOT null, +email VARCHAR(100) NULL +); +DESC users; +#尝试添加部分模拟数据，参考示例如下： +#+----+----------+----------------------------------+--------------------+ +#| id | username | password | email | +#+----+----------+----------------------------------+--------------------+ +#| 1 | admin | 112233 | admin@mxdx.com | +#+----+----------+----------------------------------+--------------------+ +INSERT INTO users VALUES(1,'admin',112233,'admin@mxdx.com'); +SELECT*FROM users; + +#4、创建订单表orders +#+--------------+--------------+------+-----+---------+-------+ +#| Field | Type | Null | Key | Default | Extra | +#+--------------+--------------+------+-----+---------+-------+ +#| id | varchar(100) | NO | PRI | NULL | | +#| order_time | datetime | NO | | NULL | | +#| total_count | int(11) | NO | | NULL | | +#| total_amount | double(11,2) | NO | | NULL | | +#| state | int(11) | NO | | NULL | | +#| user_id | int(11) | NO | MUL | NULL | | +#+--------------+--------------+------+-----+---------+-------+ +CREATE TABLE orders( +id VARCHAR(100) PRIMARY KEY NOT NULL, +order_time DATETIME NOT NULL, +total_count INT(11) NOT NULL, +total_amount DOUBLE(11,2) NOT NULL, +state INT(11) NOT NULL, +user_id INT(11) not null +); +DESC orders; +#尝试添加部分模拟数据，参考示例如下： +#+----------------+---------------------+-------------+--------------+-------+---------+ +#| id | order_time | total_count | total_amount | state | user_id | +#+----------------+---------------------+-------------+--------------+-------+---------+ +#| 15294258455691 | 2018-06-20 00:30:45 | 2 | 50.20 | 0 | 1 | +#+----------------+---------------------+-------------+--------------+-------+----- +INSERT INTO orders VALUES(152942258455691,'2018-06-20 00:30:45',2,50.20,0,1); +SELECT*FROM orders; + +#5、创建订单明细表order_items +#+----------+--------------+------+-----+---------+----------------+ +#| Field | Type | Null | Key | Default | Extra | +#+----------+--------------+------+-----+---------+----------------+ +#| id | int(11) | NO | PRI | NULL | auto_increment | +#| count | int(11) | NO | | NULL | | +#| amount | double(11,2) | NO | | NULL | | +#| title | varchar(100) | NO | | NULL | | +#| author | varchar(100) | NO | | NULL | | +#| price | double(11,2) | NO | | NULL | | +#| img_path | varchar(100) | NO | | NULL | | +#| order_id | varchar(100) | NO | MUL | NULL | | +#+----------+--------------+------+-----+---------+----------------+ +CREATE TABLE order_items( +id INT(11) UNSIGNED auto_increment PRIMARY key NOT null, +count INT(11) NOT NULL, +amount DOUBLE(11,2) NOT NULL, +title VARCHAR(100) NOT NULL, +`author` varchar(100) NOT NULL, +price DOUBLE(11,2) NOT NULL, +img_path VARCHAR(100) NOT NULL, +order_id VARCHAR(100) NOT NULL +); +DESC order_items; +#尝试添加部分模拟数据，参考示例如下： +#+----+-------+--------+---------+---------+-------+----------------+----------------+ +#| id |count| amount| title | author | price | img_path | order_id | +#+----+-------+--------+------------+----------+-------+----------------+----------------+ +#| 1 | 1 | 27.20| 解忧杂货店 | 东野圭吾 | 27.20 | static/img/default.jpg|15294258455691 | +#| 2 | 1 | 23.00| 边城 | 沈从文 | 23.00 | static/img/default.jpg|15294258455691 | +#+----+-------+--------+------------+----------+-------+------------+----------------+ +INSERT INTO order_items VALUES(1,1,27.20,'解忧杂货店','东野圭吾',27.20,'static/img/default.jpg',15294258455691),(2,1,23.00,'边城','沈从文',23.00,'static/img/default.jpg',15294258455691); +SELECT*FROM order_items; +``` + -- Gitee