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头歌实践教学平台数据库原理与应用实训答案

数据库 2023-10-10 07:10:07 278人浏览泡泡鱼

摘要

目录实训一:数据定义和操纵(4课时) 初识MySQL数据库第1关：创建数据库第2关：创建表第3关：使用主键约束第4关：外键约束第5关：添加常用约束 DDL语言的使用第1关：创建数据库第2关：创建表第3关：添加字段

第1关：insert...into方式插入数据

MySQL数据库 - 数据库和表的基本操作（一）

第3关：带 BETWEEN AND 的范围查询

单表查询（三）聚集函数

第1关：COUNT( )函数

第2关：COUNT( )函数-练习

第3关：AVG( )函数、MAX函数和MIN函数

第3关：使用 LIMIT 限制查询结果的数量

单表查询（六）综合查询

第1关：基本查询语句

第2关：带 IN 关键字的查询

第3关：带 BETWEEN AND 的范围查询

第4关：带 LIKE 的字符匹配查询

第5关：查询空值与去除重复结果实训三:多表查询(4课时)

第6关：带 AND 与 OR 的多条件查询

第7关：对查询结果进行排序

第8关：分组查询

第9关：使用 LIMIT 限制查询结果的数量

第2关：创建函数-count_credit

第3关：存储过程-调用函数count_credit

第4关：创建触发器-计算总学分!!!

第5关：创建触发器-练习级联删除操作

存储过程

第1关：建立和调用存储过程（不带输出参数的存储过程）

实训一:数据定义和操纵(4课时)

初识Mysql数据库

第1关：创建数据库

mysql -uroot -p123123 -h127.0.0.1create database MyDb;show databases;

第2关：创建表

mysql -uroot -p123123 -h127.0.0.1create database TestDb; create table t_emp( id int, name varchar(32), deptId int , salary float);

第3关：使用主键约束

mysql -uroot -p123123 -h127.0.0.1create database MyDb;use MyDb;create table t_user1(userId INT PRIMARY KEY,name VARCHAR(32),passWord VARCHAR(11),phone VARCHAR(11),email VARCHAR(32));create table t_user2(name VARCHAR(32),phone VARCHAR(11),email VARCHAR(32),PRIMARY KEY(name,phone));

第4关：外键约束

mysql -uroot -p123123 -h127.0.0.1create database MyDb;use MyDb;CREATE TABLE t_class(    id INT  PRIMARY KEY,    name VARCHAR(22) );CREATE TABLE t_student(    id INT  PRIMARY KEY,    name VARCHAR(22) ,    classId int,    CONSTRAINT fk_stu_class1 FOREIGN KEY(classId) REFERENCES t_class(id));

第5关：添加常用约束

mysql -uroot -p123123 -h127.0.0.1CREATE DATABASE MyDb;USE MyDb;CREATE TABLE t_user(    id INT  PRIMARY KEY AUTO_INCREMENT,    username VARCHAR(32) NOT NULL UNIQUE,    sex VARCHAR(4) DEFAULT '男')DEFAULT CHARSET=utf8;

DDL语言的使用

第1关：创建数据库

  create database teachingdb;

第2关：创建表

use teachingdb;     create table student(      sno char(5) primary key,      sname varchar(20) NOT null,      sdept varchar(20) not null,      sclass char(2) not null,      ssex char(1),      birthday date,      totalcredit decimal(4,1)      );

第3关：添加字段

use teachingdb;     alter table student add nativeplace varchar(20);  --   alter table student add nativeplace varchar(20);

第4关：删除字段

use teachingdb;     ALTER TABLE student DROP nativeplace;

第5关：修改字段

use teachingdb;      ALTER TABLE student MODIFY ssex varchar(3);

第6关：添加唯一性约束

use teachingdb;    alter table course add constraint uk_cno unique(cname);

DML语言的使用

第1关：insert...into方式插入数据

 use teachingdb;     INSERT INTO student  VALUES (11111,'马明','计算机','01','女','2000-01-02',null);

第2关：更新数据

 use teachingdb;   UPDATE studentSET totalcredit = 2.0   -- update student set totalcredit=2.0;

第3关：更新数据-练习

 use teachingdb;     UPDATE student   SET birthday = '2000-01-22'  WHERE sname='马小燕';

第4关：删除数据

 use teachingdb;      DELETE FROM student WHERE sno = '11111';

第5关：创建表-练习

 use teachingdb;     -- select * from  student ;create table s1 as select * from student;

第6关：删除数据-练习1

 use teachingdb;       DELETE FROM  s1 WHERE sdept='计算机';

第7关：删除数据-练习2

 use teachingdb;   drop table s1 ;

MySQL数据库 - 数据更新

第1关：插入数据

USE Company;#请在此处添加实现代码########## Begin #################### bundle insert the value #########INSERT INTO tb_emp(Id,Name,DeptId,Salary) VALUES (1,"Nancy",301,2300.00),(2,"Tod",303,5600.00),(3,"Carly",301,3200.00);########## End ##########SELECT * FROM tb_emp;########## End ##########

第2关：更新数据

USE Company;#请在此处添加实现代码########## Begin #################### update the value ##########UPDATE tb_empSET Name="Tracy",DeptId=302,Salary=4300.00WHERE id=3;########## End ##########SELECT * FROM tb_emp;########## End ##########

第3关：删除数据

USE Company;#请在此处添加实现代码########## Begin #################### delete the value ##########DELETE FROM tb_empWHERE Salary>3000;########## End ##########SELECT * FROM tb_emp;########## End ##########

MySQL数据库 - 数据库和表的基本操作（一）

第1关：查看表结构与修改表名

USE Company;########## Begin #################### modify the table name ##########ALTER table tb_emp RENAME jd_emp;########## show tables in this database ##########show tables;########## describe the table ##########describe jd_emp;########## End ##########

第2关：修改字段名与字段数据类型

USE Company;#请在此处添加实现代码########## Begin #################### change the column name ##########ALTER TABLE tb_emp change Id prod_id int(11);########## change the data type of column ##########ALTER TABLE tb_emp MODIFY Name varchar(30);########## End ##########DESCRIBE tb_emp;

第3关：添加与删除字段

USE Company;#请在此处添加实现代码########## Begin #################### add the column ##########ALTER TABLE tb_emp ADD Country varchar(20) AFTER Name; ########## delete the column ##########ALTER TABLE tb_emp DROP Salary;########## End ##########DESCRIBE tb_emp;

第4关：修改字段的排列位置

USE Company;#请在此处添加实现代码########## Begin #################### modify the column to top ##########ALTER TABLE tb_emp MODIFY Name varchar(25) FIRST;########## modify the column to the rear of another column ##########ALTER TABLE tb_emp MODIFY DeptId int(11) AFTER Salary;########## End ##########DESCRIBE tb_emp;

第5关：删除表的外键约束

USE Company;#请在此处添加实现代码########## Begin #################### delete the foreign key ##########ALTER TABLE tb_emp DROP FOREIGN KEY emp_dept;########## End ##########SHOW CREATE TABLE tb_emp \G;

实训二:单表查询(4课时)

单表查询（一）student表查询

第1关：选择列查询

 use teachingdb;     select sno 学号, sname 姓名 from student where birthday >= "2000.1.1" and birthday <= "2000.12.31";

第2关：去除重复结果

 use teachingdb;     SELECT DISTINCT snoFROM score ;

第3关：范围查询

 use teachingdb;       SELECT *FROM course WHERE ctime BETWEEN 1 AND 50;

第4关：带IN关键字的查询

 use teachingdb;     SELECT *  from student  where sdept!='计算机' and sdept!='信息';

第5关：匹配查询

 use teachingdb;     select *  from student  where sname like '%马__';

第6关：范围查询-练习

 use teachingdb;     select *  from score  where tno='052501'and grade>='80' and grade<='90' and sno like '96%';

第7关：where子句查询

 use teachingdb;       select sno, cno from score where grade is null;

单表查询（二）基本查询

第1关：基本查询语句

USE Company;#请在此处添加实现代码########## Begin #################### retrieving the Name and Salary ##########select Name,Salary from tb_emp;########## retrieving all the table ##########select * from tb_emp;########## End ##########

第2关：带 IN 关键字的查询

USE Company;#请在此处添加实现代码########## Begin #################### retrieving the Name and Salary with IN statement ##########SELECT Name,Salary FROM tb_emp WHERE Id !='1';########## End ##########

第3关：带 BETWEEN AND 的范围查询

USE Company;#请在此处添加实现代码########## Begin #################### retrieving the Name and Salary with BETWEEN AND statement ##########SELECT Name,Salary FROM tb_emp WHERE Salary BETWEEN 3000 AND 5000;########## End ##########

单表查询（三）聚集函数

第1关：COUNT( )函数

 use teachingdb;     select count(*) from student;

第2关：COUNT( )函数-练习

 use teachingdb;       select count(distinct sno)  from score;

第3关：AVG( )函数、MAX函数和MIN函数

 use teachingdb;   select cno,AVG(grade),MAX(grade),MIN(grade) from score group by(cno);

第4关：分组查询

 use teachingdb;     select sdept,count(*) from student group by sdept having count(*)<3;

第5关：倒序排列

 use teachingdb;   select sdept,sclass,COUNT(*) from student group by sdept,sclass order by count(*) desc,sdept desc;

单表查询（四）-分组操作符与聚集函数

第1关：数据统计（初级）

USE test_wyy_db_guetGOSET NOCOUNT ON -- ********** Begin ********** ---- ********** 此处写第一题的SQL语句 ********** --select count(*) from course where credit>2;-- ********** End ********** --Go -- ********** Begin ********** ---- ********** 此处写第二题的SQL语句 ********** --select sum(credit) from course where cno like "BT%";-- ********** End ********** --GO -- ********** Begin ********** ---- ********** 此处写第三题的SQL语句 ********** --select left(cno,2),count(*)from course group by left(cno,2);-- ********** End ********** --GO

第2关：数据统计初级应用

USE test_wyy_db_guetGoSET NOCOUNT ON-- ********** Begin ********** ------------ 第一题----------select count(model) from printer where color = "T" and type = "laser"; -- ********** End ********** --GO-- ********** Begin ********** ------------ 第二题----------select min(price) from printer;-- ********** End ********** --GO-- ********** Begin ********** ------------ 第三题----------select model,price from printer where price >=(select max(price) from printer);-- ********** End ********** --GO

第3关：数据统计综合应用

USE test_wyy_db_guetGoSET NOCOUNT ON---------- 第1题 ------------ ********** Begin ********** --select hd from V_test group by hd having count(*) <3;-- ********** End ********** --GO---------- 第2题 ------------ ********** Begin ********** --select max(AvgSpeed) from(select maker maker,Avg(speed) AvgSpeed from V_test  group by maker )name;-- ********** End ********** --GO---------- 第3题 ------------ ********** Begin ********** --select maker,count(*) from V_test where price>1000 group by maker;-- ********** End ********** --GO---------- 第4题 ------------ ********** Begin ********** --select maker,type,AVG(price) from V_test group by maker,type;-- ********** End ********** --GO

单表查询（五）排序和分组

第1关：对查询结果进行排序

USE School;#请在此处添加实现代码########## Begin #################### 查询1班同学的所有信息以成绩降序的方式显示结果 ##########select * from tb_score where class_id = 1 order by score desc;########## End ##########

第2关：分组查询

USE School;#请在此处添加实现代码########## Begin #################### 对班级名称进行分组查询 ##########SELECT * FROM tb_class GROUP BY class_id;########## End ##########

第3关：使用 LIMIT 限制查询结果的数量

USE School;#请在此处添加实现代码########## Begin #################### 查询班级中第2名到第5名的学生信息 ##########SELECT * FROM tb_score order by score desc LIMIT 1,4;########## End ##########

单表查询（六）综合查询

第1关：基本查询语句

USE Company;#请在此处添加实现代码########## Begin #################### retrieving the Name and Salary ##########select Name,Salary from tb_emp;########## retrieving all the table ##########select * from tb_emp;########## End ##########

第2关：带 IN 关键字的查询

USE Company;#请在此处添加实现代码########## Begin #################### retrieving the Name and Salary with IN statement ##########SELECT Name,Salary FROM tb_emp WHERE Id NOT IN (1);########## End ##########

第3关：带 BETWEEN AND 的范围查询

USE Company;#请在此处添加实现代码########## Begin #################### retrieving the Name and Salary with BETWEEN AND statement ##########SELECT Name,Salary FROM tb_emp WHERE Salary BETWEEN 3000 AND 5000;########## End ##########

第4关：带 LIKE 的字符匹配查询

USE Company;######### Begin #########SELECT Name,Salary FROM tb_emp WHERE Name LIKE "C%";######### End #########

第5关：查询空值与去除重复结果实训三:多表查询(4课时)

USE Company;######### Begin #########SELECT * FROM tb_emp WHERE DeptId IS NULL;######### End ################## Begin #########SELECT DISTINCT Name FROM tb_emp;######### End #########

第6关：带 AND 与 OR 的多条件查询

USE Company;######### Begin #########SELECT * FROM tb_emp WHERE DeptId=301 AND Salary > 3000;######### End ################## Begin #########SELECT * FROM tb_emp WHERE DeptId=301 OR DeptId=303;######### End #########

第7关：对查询结果进行排序

USE School;#请在此处添加实现代码########## Begin #################### 查询1班同学的所有信息以成绩降序的方式显示结果 ##########select * from tb_score where class_id = 1 order by score desc;########## End ##########

第8关：分组查询

USE School;#请在此处添加实现代码########## Begin #################### 对班级名称进行分组查询 ##########SELECT * FROM tb_class GROUP BY class_id;########## End ##########

第9关：使用 LIMIT 限制查询结果的数量

USE School;#请在此处添加实现代码########## Begin #################### 查询班级中第2名到第5名的学生信息 ##########SELECT * FROM tb_score order by score desc LIMIT 1,4;########## End ##########

实训三:多表查询(4课时)

多表查询-子查询（一）

第1关：子查询

 use teachingdb;       select sname, birthday from student where birthday < (select birthday from student where sname = "刘东明");

第2关：子查询-练习

 use teachingdb;   select student.sno,student.sname from student left join score on student.sno=score.sno where score.sno is null;

第3关：子查询-练习一

 use teachingdb;     select sname,sdept,birthday from student where birthday < any(select birthday from student where sdept="数学") and sdept <> "数学";

第4关：子查询-练习二

 use teachingdb;     select student.sname,student.sdept from student,score where student.sno=score.sno and score.cno="004";

第5关：子查询-练习三

 use teachingdb;   select score.sno from score where cno in (select score.cno from score,student where student.sno=score.sno and student.sname='刘东明') and score.sno not in(select student.sno from student where student.sname='刘东明') group by sno having count(cno) >=(select count(cno) from score,student where score.sno=student.sno and student.sname='刘东明')

第6关：子查询-练习四

 use teachingdb;   select distinct score.sno from score group by sno having count(cno) >=(select count(cno) from course);

多表查询 - 子查询（二）

第1关：带比较运算符的子查询

USE Company;#请在此处添加实现代码########## Begin ###########1.查询大于所有平均年龄的员工姓名与年龄   select  name, age from tb_emp where age > (select avg(age) from tb_emp );

第2关：关键字子查询

USE Company;#请在此处添加实现代码########## Begin ###########1.使用 ALL 关键字进行查询select position,salary from tb_salary where salary >(select max(salary) from tb_salary where position="Java");#2.使用 ANY 关键字进行查询select position,salary from tb_salary where salary >(select min(salary) from tb_salary where position="Java");#3.使用 IN 关键字进行查询select position,salary from tb_salary where position="Java";########## End ##########

多表查询-连接查询（一）

第1关：自然连接

 use teachingdb;   select student.sname,course.cname,teach.tname,score.grade from student,score,course,teach where student.sno=score.sno and score.tno=teach.tno and score.cno=course.cno and teach.tname="严敏" and course.cname="数学分析";

第2关：等值连接

 use teachingdb;     select student.sname,course.cname,teach.tname,score.grade from student,score,course,teach where student.sno=score.sno and score.tno=teach.tno and score.cno=course.cno and teach.tname="严敏" and course.cname="数学分析";

第3关：JOIN连接

 use teachingdb;       select student.sname,course.cname,teach.tname,score.grade from student,score,course,teach where student.sno=score.sno and score.tno=teach.tno and score.cno=course.cno and teach.tname="严敏" and course.cname="数学分析";

第4关：自身连接查询

 use teachingdb;     select s2.sname,s2.birthday from student s1,student s2 where s1.sname="刘东明" and s1.birthday>s2.birthday;

第5关：外部连接查询

 use teachingdb;     select student.sno,student.sname  from student left join score on student.sno=score.sno where score.sno is null;

多表查询- 连接查询（二）

第1关：内连接查询

USE School;########## 查询数据表中学生姓名和对应的班级 ###########请在此处添加实现代码########## Begin ##########select tb_student.name studentName,tb_class.name className from tb_student,tb_class where tb_student.class_id=tb_class.id ########## End ##########

第2关：外连接查询

USE School;########## 使用左外连接查询所有学生姓名和对应的班级 ###########请在此处添加实现代码########## Begin ##########select s1.name studentName,s2.name className from tb_student s1 left join tb_class s2 on s1.class_id=s2.id;########## End #################### 使用右外连接查询所有学生姓名和对应的班级 ###########请在此处添加实现代码########## Begin ##########select s1.name studentName,s2.name className from tb_student s1 right join tb_class s2 on s1.class_id=s2.id; ########## End ##########

第3关：复合条件连接查询

USE School;########## 查询所有班级里分数在90分以上的学生的姓名和学生的成绩以及学生所在的班级 ###########请在此处添加实现代码########## Begin ##########select tb_student.name studentName,tb_student.score,tb_class.name className from tb_student,tb_class where tb_student.class_id=tb_class.id and score>90;########## End ##########

大学数据库创建与查询实战

第1关：数据库表设计

use universityDB;create table instructor(    ID varchar(5) ,primary key(ID),    name varchar(20) NOT NULL,    dept_name varchar(20) DEFAULT NULL ,    salary numeric(8,2)  check(salary>29000),    foreign key (dept_name) references department(dept_name)        on delete set null);create table section(    course_id varchar(8)  ,    sec_id varchar(8) ,    semester varchar(6)  check(semester in('Fall','Winter','spring','Summer')),    year numeric(4,0)  ,    building varchar(15)  ,    room_number varchar(7)   ,    time_slot_id varchar(4) ,    primary key (course_id, sec_id, semester, year),     foreign key (course_id) references course(course_id)        on delete cascade,     foreign key (building, room_number) references classroom(building, room_number));########## End ##########

第2关：查询（一）

#********* Begin *********#echo "select namefrom student where dept_name='Biology'; select name from instructor where salary> any(select salary from instructor where dept_name='Biology'); select name,department.dept_name,building from instructor ,department where instructor.dept_name=department.dept_name; select distinct instructor.dept_namefrom instructor,department where instructor.dept_name=department.dept_name and building='Watson'; "#********* End *********#

第3关：查询（二）

#********* Begin *********#echo "select count(distinct ID) from teaches where semester ='spring' and year='2010';select instructor.ID,name,dept_name from teaches,instructor where semester='Fall'and year='2009' and teaches.ID=instructor.ID group by ID having count(distinct course_id)=2;select dept_name, count(distinct instructor.ID) as instr_count from instructor,teaches where semester='Spring' and year='2010' and instructor.ID=teaches.ID group by dept_name having count(distinct course_id)>=1"#********* End *********#

第4关：查询（三）

#********* Begin *********#echo "select instructor.* from instructor order by salary desc,name asc ;select max(salary) from instructor;select dept_name from instructor group by dept_name having avg(salary)=(select max(avgs) from(select avg(salary) avgs,dept_name  from instructor group by dept_name) a);select dept_name, avg(salary) as avg_salary from instructor group by dept_name having avg(salary)>50000  order by dept_name asc,avg(salary) desc;"#********* End *********#

第5关：查询（四）

#********* Begin *********#echo "select distinct course_id from section where semester='Fall' and year=2009 andcourse_id not in (select course_id from section where semester='Spring' andyear=2010); select course_id from section as S where year=2009 and semester='Fall' and exists(select section.* from section as T where year=2010 and semester='Spring' andS.course_id=T.course_id); select course_id from section where year=2009 and semester='Fall' union all selectcourse_id from section where year=2010 and semester='Spring'; select course_id,semester,year,sec_id,avg(tot_cred) from takes join student join department on takes.ID = student.ID where year=2009 group by course_id,semester,year,sec_id having count(takes.ID)>=13;  "#********* End *********#

第6关：查询（五）

#********* Begin *********#echo "select instructor.name,teaches.course_id from instructor,teaches where instructor.ID=teaches.ID and dept_name='Physics'; select name from instructor where dept_name='Physics' and salary>80000;update instructor set salary = case when salary <= 100000 then salary*1.05 else salary*1.03 end;create view Physics_fall_2009 as select course.course_id,building,room_number from course,section where course.course_id = section.course_id and course.dept_name='Physics' and section.semester='Fall' and section.year='2009';  "#********* End *********#

实训四:索引与视图(2课时)

MySQL开发技巧 - 索引
第1关：索引

use School;#请在此处添加实现代码########## Begin ###########1.创建名为pk_student的主键索引create table student(    stu_id int not null,    name varchar(25) not null,    age int not null,    sex char(2) not null,    classes int not null,    grade int not null,    primary key(stu_id) );#2.创建名为idx_age的普通索引create index idx_age on student(age);#3.创建名为uniq_classes的唯一索引create unique index uniq_classes on student(classes);#4.创建名为idx_group的组合索引create index idx_group on student(name,sex,grade);########## End ##########

MySQL开发技巧 - 视图

第1关：视图

use School;#请在此处添加实现代码########## Begin ##########create view stu_view as select math,chinese,math+chinese from student;#1.创建单表视图create view stu_classes as select student.stu_id,name,classes from student,stu_info where student.stu_id=stu_info.stu_id;#2.创建多表视图########## End ##########

索引(teachingdb数据库）

第1关：索引

 use teachingdb;       create index idx_sname on student(sname);

第2关：删除索引-练习

 use teachingdb;     drop index idx_sname;

SQL视图（teachingdb数据库)

第1关：创建视图

 use teachingdb;     create view student_cs as select * from student where sdept="计算机";

第2关：创建视图-练习一

 use teachingdb;    create view v_grade_avg as select sno 学号, avg(grade) 平均成绩 from score group by sno;

MySQL-索引和视图

第1关：建立索引

 use province; #代码开始alter table jdxx add primary key zsy(sf,cs,qx,name);create index namesy on jdxx(name);  #代码结束 show index in jdxx\g;

第2关：建立视图并更新视图

use province;#代码开始create view csxx as select qx,name from jdxx where qx in('天心区','宁乡县','岳麓区','开福区','望城县','浏阳市','芙蓉区','长沙县','雨花区');update csxx set name="月湖街道" where name="西湖街道" and qx='开福区';#代码结束select * from csxx;

第3关：建立基于多表的视图

use province #代码开始 create view csbm as select jdxx.qx,jdxx.name,qxyzbm.qxbm from jdxx,qxyzbm where jdxx.qx=qxyzbm.qx and jdxx.cs='长沙市'; #代码结束 select * from csbm;

实训五:数据库安全控制(2课时）

创建用户

第1关：创建用户

 use teachingdb;     create user user1 @localhost identified by 'user1';

第2关：创建用户-练习!!!

         create user user2 identified by 'user2';

授权及回收权限

第1关：授权

 use teachingdb;   GRANT USAGE ON *.* TO 'user1'@'localhost' ;GRANT ALL PRIVILEGES ON `teachingdb2`.* TO 'user1'@'localhost';

第2关：授权-练习一

 use teachingdb;    grant select on teachingdb.* to user1@localhost with grant option;

第3关：授权-练习二

 use teachingdb;       #grant all on teachingdb to user1@localhost, user2@localhost;    grant all on student to user1@localhost, user2@localhost;

第4关：授权-练习三

 use teachingdb;        #grant update(grade) on score to user2@localhost;

第5关：回收权限

 use teachingdb;     revoke select on teachingdb.* from user1@localhost;

MySQL-安全性控制

第1关：用户和权限

# 请填写语句，完成以下功能：#(1) 创建用户tom和jerry，初始密码均为'123456'；create user tom identified by '123456';create user jerry identified by '123456';#(2) 授予用户tom查询客户的姓名，邮箱和电话的权限,且tom可转授权限；grant 权限[,权限] ... on 数据库对象 to user|role,[user|role]... [with grant option]grant select(c_name,c_mail,c_phone) on client to tom with grant option;#(3) 授予用户jerry修改银行卡余额的权限；grant update(b_balance) on bank_card to jerry;#(4) 收回用户Cindy查询银行卡信息的权限。revoke select on bank_card from Cindy;#revoke 权限[,权限]... on 数据库对象 from user|role[,user|role]...

第2关：用户、角色与权限

# 请填写语句，完成以下功能：# (1) 创建角色client_manager和fund_manager；create role client_manager,fund_manager;# (2) 授予client_manager对client表拥有select,insert,update的权限；grant select,insert,update on client to client_manager;   # (3) 授予client_manager对bank_card表拥有查询除银行卡余额外的select权限；grant select(b_number,b_type,b_c_id)on bank_card to client_manager;# (4) 授予fund_manager对fund表的select,insert,update权限；grant select,insert,update on fund to fund_manager;# (5) 将client_manager的权限授予用户tom和jerry；grant client_manager to tom,jerry;# (6) 将fund_manager权限授予用户Cindy.grant fund_manager to Cindy;

MySQL数据库 - 授权与撤销授权

第1关：数据库授权

##########  开始编写 SQL  ####################  开始编写 SQL  ##########-- set password for casual_user@localhost=password('123456');-- grant select,insert,update on *.* to-- casual_user@localhost identified by'123456';-- grant select,insert,update  on *.* to casual_user@'localhost' identified by "123123";set password for casual_user@'localhost' = Password('123456');grant select,insert,update on *.* to casual_user@'localhost' identified by "123456";

第2关：数据库撤销权限

##########  开始编写 SQL  ##########-- revoke all-- on mydb1.table1-- from 'user1'@'localhost';-- revoke all-- on mydb1.table2-- from 'user1'@'localhost';-- revoke insert,select,update,create,delete,alter-- on mydb2.*-- from 'user2'@'localhost';-- revoke all on mydb1.table1 from 'user1'@'ip';revoke all on mydb1.table1 from user1@'localhost';revoke all on mydb1.table2 from user1@'localhost';revoke select,update,insert,create,delete,alter on mydb2.* from user2@'localhost';

实训六:数据完整性

实训七:存储过程与触发器(4课时）

存储过程、函数与触发器

第1关：创建存储过程

 use teachingdb;     delimiter $$  create procedure pro_findname(in name char(3))  Begin  select * from student where sname like concat ('%',name,'%');  End  $$  delimiter ;

第2关：创建函数-count_credit

 use teachingdb;   delimiter $create function count_credit(psno char(10)) returns intBegindeclare xx int;select sum(credit) from course where cno in(  select cno from score where grade >=60 and sno=psno) into xx;return xx;end$delimiter ;

第3关：存储过程-调用函数count_credit

 use teachingdb;      delimiter //   create procedure p_count_credit()   Begin   declare flag boolean default true;   declare psno char(5);   declare stu_cur cursor for select sno from student;   declare continue handler for not found set flag=false;   open stu_cur;   while flag do   fetch stu_cur into psno;   update student set totalcredit=count_credit(psno) where sno=psno;   end while;   close stu_cur;   end //  delimiter ;

第4关：创建触发器-计算总学分!!!

 use teachingdb;     delimiter $$  drop trigger if exists sum_credit$$  create trigger sum_credit after insert on score  for each row  Begin  update student set totalcredit=totalcredit  (select credit from course where cno=new.cno)  where sno=new.sno and new.grade>=60;  end $$  delimiter ;

第5关：创建触发器-练习级联删除操作

 use teachingdb;     delimiter $$  drop trigger if exists del_student_score$$  create trigger del_student_score before delete  on student  for each row  Begin  delete from score where sno=old.sno;  end$$  delimiter ;

存储过程

第1关：建立和调用存储过程（不带输出参数的存储过程）

 use province; #代码开始 #定义过程 #调用过程use province;#代码开始delimiter $$create procedure dqxx(in city varchar(10),in district varchar(10)) begin     declare x int;    declare jd int;    declare z int;    declare Qt int;    select count(name) from jdxx where cs = city and qxmc = district and name like "%乡" into x;    select count(name) from jdxx where cs = city and qxmc = district and name like "%街道" into jd;    select count(name) from jdxx where cs = city and qxmc = district and name like "%镇" into z;    select count(name) from jdxx where cs = city and qxmc = district and name not like "%镇" and name not like "%街道" and name not like "%乡" into qt;    select x 乡, jd 街道, z 镇, qt 其他;end $$delimiter ;call dqxx("长沙市", "开福区");call dqxx("厦门市", "同安区");#代码结束 #代码结束

第2关：建立和调用存储过程（带输出参数）

 use sale; #代码开始 #定义过程 #调用过程use sale;#代码开始delimiter $$create procedure ygyj(in nf int, in yf int, in xm varchar(10), out pj varchar(10))begin    declare jg int;    select sum(sjfk) from xsd join gzry on gzry.gyh = xsd.gyh where year(xsrq) = nf and month(xsrq) = yf and gyxm = xm into jg;    case        when isnull(jg) then set pj = "无业绩";        when jg < 5000 then set pj = "不达标";        when jg < 10000 then set pj = "达标";        else set pj = "优秀";    end case;end $$delimiter ;call ygyj(2015, 7, "王雅静", @yj1);call ygyj(2015, 6, "廖秉娴", @yj2);call ygyj(2015, 7, "赵敏", @yj3);call ygyj(2015, 7, "章伟", @yj4);#代码结束select @yj1,@yj2,@yj3,@yj4;

第3关：建立和调用存储函数

use sale;#代码开始#函数定义#调用函数use sale;#代码开始delimiter $$create function gkjb(nf int, xm varchar(10))    returns varchar(10)DETERMINISTICbegin    declare jg int;    declare pj varchar(10);    select sum(sjfk)    from xsd join gk on gk.hyh = xsd.hyh     where name = xm and year(xsrq) = nf into jg;        case        when isnull(jg) then        set pj = "非会员";        when jg < 5000 then        set pj = "一般会员";        when jg < 10000 then        set pj = "vip";        else set pj = "超级vip";        end case;    return pj;end $$delimiter ;select name 姓名, gkjb(2015, name) 等级 from gk;#代码结束

第4关：修改多个数据表的存储过程

 use library; #代码开始 #定义过程 #调用过程use library;#代码开始delimiter $$create procedure hs(in sh varchar(8), in dzbh varchar(3), in rq date, out zt varchar(12))begin    declare jywh int;    select count(*) from borrow where txm=sh and dzzh=dzbh and isnull(hsrq) into jywh;    if jywh=0 then        set zt = "没有该借阅";    else        update borrow set hsrq=rq where dzzh=dzbh and txm=sh and isnull(hsrq);        update book set zk=1 where txm=sh;        set zt = "还书成功";    end if;end $$delimiter ;call hs("P0000001", "001", "2022-5-1", @zt1);call hs("P0000001", "002", "2022-5-1", @zt2);#代码结束select @zt1,@zt2;select txm, sm, zk from book;select * from borrow;

第5关：使用游标的存储过程

 use province; #代码开始use province;#代码开始delimiter $$create procedure tjdq(in sm varchar(10))begin    declare flag int default 1;    declare city varchar(10);    declare qx varchar(10);    declare jd int;    declare x int;    declare z int;    declare qt int;    declare dq cursor for select distinct cs, qxmc from jdxx where sf = sm;    declare continue handler for not found set flag = 0;    delete from dqtj;    open dq;        fetch dq into city, qx;        while flag = 1 do            select count(*) from jdxx where cs = city and qxmc = qx and name like "%街道" into jd;            select count(*) from jdxx where cs = city and qxmc = qx and name like "%乡" into x;            select count(*) from jdxx where cs = city and qxmc = qx and name like "%镇" into z;            select count(*) from jdxx where cs = city and qxmc = qx and name not like "%镇" and name not like "%街道" and name not like "%乡" into qt;            insert into dqtj values(city, qx, x, jd, z, qt);            fetch dq into city, qx;        end while;    close dq;end $$delimiter ;call tjdq("安徽省");#代码结束select * from dqtj;

来源地址：https://blog.csdn.net/dgdwa/article/details/131341475

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