From 7e312016a41c5ff8e2eeeeeea57e41a563fc2797 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E8=B5=B5=E5=90=91=E6=9E=97?= <2959084991@qq.com> Date: Wed, 22 Feb 2023 20:13:36 +0800 Subject: [PATCH] =?UTF-8?q?=E8=B5=B5=E5=90=91=E6=9E=97=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../20220219 \344\275\234\344\270\232.md" | 306 ++++++++++++++++++ ...46\346\235\237\344\275\234\344\270\232.md" | 223 +++++++++++++ .../README.md" | 0 ...2\344\272\272\344\275\234\344\270\232.sql" | 56 ++++ 4 files changed, 585 insertions(+) create mode 100644 "51 \350\265\265\345\220\221\346\236\227/20220219 \344\275\234\344\270\232.md" create mode 100644 "51 \350\265\265\345\220\221\346\236\227/20220220\347\272\246\346\235\237\344\275\234\344\270\232.md" rename README.md => "51 \350\265\265\345\220\221\346\236\227/README.md" (100%) create mode 100644 "51 \350\265\265\345\220\221\346\236\227/\344\270\252\344\272\272\344\275\234\344\270\232.sql" diff --git "a/51 \350\265\265\345\220\221\346\236\227/20220219 \344\275\234\344\270\232.md" "b/51 \350\265\265\345\220\221\346\236\227/20220219 \344\275\234\344\270\232.md" new file mode 100644 index 0000000..d355e30 --- /dev/null +++ "b/51 \350\265\265\345\220\221\346\236\227/20220219 \344\275\234\344\270\232.md" @@ -0,0 +1,306 @@ +## 第1题 + +1、创建数据库test01_market + +**create database test01_market;** + +2、创建表格customers + +**use test01_market;** + +**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) + +**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;** + +## 第2题 + +1、创建数据库test02_library + +**create database test02_library;** + +2、创建表格books + +**use test02_library** + +**create table books(** + +**b_id int(11) not null unique comment '书编号',** + +**b_name varchar(50) not null comment '书名',** + +**authors varchar(100) not null comment '作者',** + +**price float not null comment '价格',** + +**pubdate year not null comment '出版日期',** + +**note varchar(100) comment '说明',** + +**num int(11) not null comment '库存'** + +**);** + +| 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);** + +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 Blade',30,2010,'law',0),** + +**(6,'The Battle','Upton Sara',30,1999,'medicine',40),** + +**(7,'Rose Hood','Richard 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。 + +**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;** + +## 第3题 + +1、创建数据库test03_bookstore + +**create database test03_bookstore;** + +2、创建book表 + +**create database test03_bookstore;** +**USE test03_bookstore;** +**create table book(** +**id int(11) primary key auto_increment,** +**title varchar(100) not null ,** +**author 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** +**);** + +```mysql ++----------+--------------+------+-----+---------+----------------+ +| 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 | | ++----------+--------------+------+-----+---------+----------------+ +``` + +尝试添加部分模拟数据,参考示例如下: + +**insert book values (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');** + +```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 | ++----+---------------+------------+-------+-------+-------+----------------------------+ +``` + +3、创建用户表users,并插入数据 + +**create users(** +**id int(11) primary key auto_increment,** +**username varchar(100) not null unique ,** +**password varchar(100) not null ,** +**email varchar(100)** +**);** + +```mysql ++----------+--------------+------+-----+---------+----------------+ +| 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 | | ++----------+--------------+------+-----+---------+----------------+ +``` + +尝试添加部分模拟数据,参考示例如下: + +**insert users values (1,'admin','112233','admin@mxdx.com' );** + +```mysql ++----+----------+----------------------------------+--------------------+ +| id | username | password | email | ++----+----------+----------------------------------+--------------------+ +| 1 | admin | 112233 | admin@mxdx.com | ++----+----------+----------------------------------+--------------------+ +``` + +4、创建订单表orders + +**create table orders(** +**id varchar(100) primary key ,** +**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** +**);** +**alter table orders add index (user_id);** + +```mysql ++--------------+--------------+------+-----+---------+-------+ +| 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 | | ++--------------+--------------+------+-----+---------+-------+ +``` + +尝试添加部分模拟数据,参考示例如下: + +**insert into orders values ('15294258455691 ','2018-06-20 00:30:45',2,50.20,0,1);** + +```mysql ++----------------+---------------------+-------------+--------------+-------+---------+ +| id | order_time | total_count | total_amount | state | user_id | ++----------------+---------------------+-------------+--------------+-------+---------+ +| 15294258455691 | 2018-06-20 00:30:45 | 2 | 50.20 | 0 | 1 | ++----------------+---------------------+-------------+--------------+-------+---------+ +``` + +5、创建订单明细表order_items + +**create table order_items(** +**id int(11) primary key auto_increment,** +**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** +**);** +**alter table order_items add index (order_id);** + +```mysql ++----------+--------------+------+-----+---------+----------------+ +| 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 | | ++----------+--------------+------+-----+---------+----------------+ +``` + +尝试添加部分模拟数据,参考示例如下: + +**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');** + +```mysql ++----+-------+--------+---------+---------+-------+----------------+----------------+ +| 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 | ++----+-------+--------+------------+----------+-------+------------+----------------+ +``` + diff --git "a/51 \350\265\265\345\220\221\346\236\227/20220220\347\272\246\346\235\237\344\275\234\344\270\232.md" "b/51 \350\265\265\345\220\221\346\236\227/20220220\347\272\246\346\235\237\344\275\234\344\270\232.md" new file mode 100644 index 0000000..9768b08 --- /dev/null +++ "b/51 \350\265\265\345\220\221\346\236\227/20220220\347\272\246\346\235\237\344\275\234\344\270\232.md" @@ -0,0 +1,223 @@ +-- 1、创建数据库test01_company +create database test01_company charset utf8; +use test01_company; +-- 2、创建表格offices +create table offices(officeCode int,city varchar(30),address varchar(50),country varchar(50),postalCode varchar(25)); +-- | 字段名 | 数据类型 | +-- | ---------- | ----------- |rt +-- | officeCode | int | +-- | city | varchar(30) | +-- | address | varchar(50) | +-- | country | varchar(50) | +-- | postalCode | varchar(25) | +-- +-- 3、创建表格employees +create table employees(empNum int(11),lastName varchar(50),firstName varchar(50),mobile varchar(25),code int,jobTitle varchar(50),birth date,Note varchar(255),Sex varchar(5)); +-- | 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) | +-- | Sex | varchar(5) | +-- +-- **要求4:**将表employees的mobile字段修改到code字段后面。 +alter table employees modify column mobile varchar(50) 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 column 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_info +alter table employees rename employees_info; + +## 第2题 + +-- 1、创建数据库test02db +create database test02db charset utf8; +-- 2、创建表格pet +create table pet(name varchar(20),owner varchar(20),species varchar(20),sex char(1),birth year,death year); +-- | 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 | +-- +-- 3、添加记录 +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),('Chirpy',null,'Bird','f',2008,null); +-- | 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 | | +-- +-- 4、 添加字段主人的生日owner_birth。 +alter table pet add owner_birth varchar(50); +-- 5、 将名称为Claws的猫的主人改为kevin +update pet set owner='kevin' where name='Claws'; +-- 6、 将没有死的狗的主人改为duck +update pet set owner='duck' where isnull(death) and species='Dog'; +-- 7、 查询没有主人的宠物的名字; +select * from pet where isnull(owner); +-- 8、 查询已经死了的cat的姓名,主人,以及去世时间; +select name,owner,death from pet where death !='' and species='Cat'; +-- 9、 删除已经死亡的狗 +delete from pet where death !='' and species='Dog'; +-- 10、查询所有宠物信息 +select * from pet; +-- + + +## 第3题 + +-- 1、创建数据库:test03_company +create database test03_company charset utf8; +-- 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。 +-- +-- ```mysql +use test03_company ; +create table department( + depid int primary key auto_increment, + depname char(10) not null unique key, + deinfo varchar(200) +); +desc department; +-- ``` +-- +-- 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; +-- +-- ```mysql +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 , + foreign key (depid) references department(depid) +); +-- ``` +-- +-- 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) +create table salary( + empid int not null primary key auto_increment, + basesalary varchar(10)not null, + titlesalary varchar(10)not null, + deduction varchar(10), + foreign key (empid) references employee(empid) +); + +-- 4、添加数据如下: +-- +-- 部门表: +insert into department values(111,'生产部',null),(222,'销售部',null),(333,'人事部','人力资源管理'); +-- | 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 | +-- +-- 雇员表: +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); +-- | 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 | +-- +-- 工资表: +insert into salary values(1001,2200,1100,200),(1002,1200,200,null),(1003,2900,700,200),(1004,1950,700,150); +-- | 雇员编号 | 基本工资 | 职务工资 | 扣除 | +-- | -------- | -------- | -------- | ---- | +-- | 1001 | 2200 | 1100 | 200 | +-- | 1002 | 1200 | 200 | NULL | +-- | 1003 | 2900 | 700 | 200 | +-- | 1004 | 1950 | 700 | 150 | + + +## 第4题 + +-- 1、创建一个数据库:test04_school +create database test04_school charset utf8; +use test04_school; +-- 2、创建如下表格 +-- +-- 表1 Department表的定义 +create table Department( + DenNo int(10)primary key unique key, + DepName varchar(20)not null, + DepNote varchar(50) +); +-- | **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 | +-- +-- 表2 Teacher表的定义 +create table teacher( + Number int unique key primary key, + Name varchar(30)not null, + Sex varchar(4), + Birth date, + DepNO int, + Salary float, + Address varchar(100), + foreign key (DepNo) references Department(DenNo) +); +-- | **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 | +-- +-- 3、添加记录 +insert into department 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'); +-- | **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 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'); +-- | **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 | +-- +-- 4、用SELECT语句查询Teacher表的所有记录。 +-- +select * from teacher; + + + + diff 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