建议用 TXT 文档来写代码 然后粘贴至cmd命令直接运行
创建students库,表名为student,表包含以下字段: id(主键) name(姓名) age(年龄) sex(性别) sc(综合积分) ; insert student values(0,"小姐",1,24,188) create table student( id int auto_increment primary key not null, name varchar(10) not null, sex enum("男","女","中性"), age int , jf int )default charset="utf8"; 3)(10分)向表里添加5条数据,自定义各个字段数据类型; insert student values(0,"小刘",1,20,158); insert student values(0,"小崔",2,21,159); insert student values(0,"小钱",3,22,128); insert student values(0,"小林",2,23,138); insert student values(0,"小姐",1,24,188); 4)(10分)查询出所有学生的信息,并输出; select * from student; 5)(10分)查询所有女生的信息,并输出 select * from student where sex=2; 6)(10分)查询所有男生且综合积分49分以下的信息,并输出 select * from student where sex=1 and jf=158; 7)(10分)给综合积分低于49分以下的同学,综合积分加上50,并查看信息 update student set jf=jf+50 where jf=158; 8)(10分)查询出所有姓张的同学的信息,并输出。 select * from student where name like "%小%"; 9)(10分)删除ID是1的记录,如果没有相关记录则提示 delete from student where id=1; 10)(10分)将性别为女的记录年龄统一加2岁,并查看信息 update student set age=age+2 where sex=2; 11)(10分)查看所有同学的综合积分情况 select jf from student;
1. 使用sql语句创建数据库,名称为CustomDB 2. 创建数据表customer(客户)、deposite(存款)、bank(银行),表结构如下:(10分) customer的表结构 | 属性名称 | 类型与长度 | 中文含义 | 备注 |
| -------- | ------------ | -------- | ---------- |
| c_id | char(6) | 客户标识 | 主键,非空 |
| name | varchar(30) | 客户姓名 | 非空 |
| location | Varchar(30) | 工作地点 | |
| salary | decimal(8,2) | 工资 | | bank的表结构 | 属性名称 | 类型与长度 | 中文含义 | 备注 |
| --------- | ---------- | -------- | ---------- |
| b_id | char(5) | 银行标识 | 主键,非空 |
| bank_name | char(30) | 银行名次 | 非空 | deposite的表结构 | 属性名称 | 类型与长度 | 中文含义 | 备注 |
| --------- | ------------ | ---------- | -------------------------- |
| d_id | int | 存款流水号 | 主键,非空,自增 |
| c_id | char(6) | 客户标识 | 外键,关联customer表的c_id |
| b_id | char(5) | 银行标识 | 外键,关联bank表的b_id |
| dep _date | date | 存入日期 | |
| amount | decimal(8,2) | 存款金额 | |
3、录入数据: customer的数据如下 | c_id | name | location | salary |
| ------ | ---- | -------- | ------ |
| 101001 | 孙杨 | 广州 | 1234 |
| 101002 | 郭海 | 南京 | 3526 |
| 101003 | 卢江 | 苏州 | 6892 |
| 101004 | 郭惠 | 济南 | 3492 | bank的数据如下: | b_id | bank_name |
| ----- | --------- |
| B0001 | 工商银行 |
| B0002 | 建设银行 |
| B0003 | 中国银行 |
| B0004 | 农业银行 | deposite的数据如下: | d_id | c_id | b_id | dep_date | amount |
| ---- | ------ | ----- | ---------- | ------ |
| 1 | 101001 | B0001 | 2011-04-05 | 42526 |
| 2 | 101002 | B0003 | 2012-07-15 | 66500 |
| 3 | 101003 | B0002 | 2010-11-24 | 42366 |
| 4 | 101004 | B0004 | 2008-03-31 | 62362 |
| 5 | 101001 | B0003 | 2002-02-07 | 56346 |
| 6 | 101002 | B0001 | 2004-09-23 | 353626 |
| 7 | 101003 | B0004 | 2003-12-14 | 36236 |
| 8 | 101004 | B0002 | 2007-04-21 | 26267 |
| 9 | 101001 | B0002 | 2011-02-11 | 435456 |
| 10 | 101002 | B0004 | 2012-05-13 | 234626 |
| 11 | 101003 | B0003 | 2001-01-24 | 26243 |
| 12 | 101004 | B0001 | 2009-08-23 | 45671 |
4、修改数据(sql语句实现): 1.将数据表deposite中孙杨的存款金额加10000 2.将数据表deposite中所属账户为工商银行并且存入日期为2011-04-05的人员的存款金额加1000 3.将数据表deposite中郭海的银行标识改为建设银行 5、查询数据(sql语句实现): 1.查询孙杨的存款信息(显示信息:客户ID,客户姓名,银行名称,存款金额) 2.查询日期为2011-04-05这一天进行过存款的客户ID,客户姓名,银行名称,存款金额 3.查询郭海在工商银行的存款信息(显示信息:客户ID,客户姓名,银行标识,银行名称,存款日期,存款金额) 4.查询工商银行存款大于等于一万的客户姓名(使用表链接和子查询两种方式实现) 5.查询在农业银行存款前五名的客户存款信息(显示信息:客户姓名,银行名称,存款金额) 6.查询姓“卢”的客户的存款信息(显示信息:客户姓名,银行名称,存款金额) 1. 使用sql语句创建数据库,名称为CustomDB 答:`create database if not exists CustomDB;` 2. 创建表,代码如下: 答: ``` /*创建顾客表*/ create table if not exists customer( c_id char(6) primary key, name varchar(30)not null, location varchar(30), salary decimal(8,2) ); /*插入数据*/ insert into customer values('101001','孙杨','广州',1234), ('101002','郭海','南京',3526), ('101003','卢江','苏州',6892), ('101004','郭惠','济南',3492); /*创建银行表*/ create table if not exists bank( b_id char(5) primary key, bank_name char(30) not null ); insert into bank values('B0001','工商银行'), ('B0002','建设银行'), ('B0003','中国银行'); insert into bank values('B0004','农业银行'); /*创建存款表(注意外键的代码使用)*/ create table if not exists deposite( d_id int(10) auto_increment primary key, c_id char(6), b_id char(5), dep_date date, amount decimal(8,2), constraint FK_c_id foreign key(c_id) references customer(c_id) ); CREATE TABLE `deposit` ( `d_id` int NOT NULL AUTO_INCREMENT PRIMARY KEY , `c_id` varchar(6) , `b_id` varchar(5) , `dep_date` date , `dep_type` enum('1','3','5') , `amount` decimal(8,2) , FOREIGN KEY (`c_id`) REFERENCES `customer` (`c_id`), FOREIGN KEY (`b_id`) REFERENCES `bank` (`b_id`) ); create table deposite( d_id int not null auto_increment primary key, c_id varchar(6), b_id varchar(5), dep_date date, dep_type enum('1','3','5'), amount decimal(8,2), foreign key(c_id) references customer(c_id), foreign key(b_id) references bank(b_id) ); insert into deposite values(1,'101001','B0001','2011-04-05',1,42526), (2,'101002','B0003','2012-07-15',1,66500), (3,'101003','B0002','2010-11-24',2,42366), (4,'101004','B0004','2008-03-31',3,62362), (5,'101001','B0003','2002-02-07',3,56346), (6,'101002','B0001','2004-09-23',1,353626), (7,'101003','B0004','2003-12-14',2,36236), (8,'101004','B0002','2007-04-21',1,26267), (9,'101001','B0002','2011-02-11',1,435456), (10,'101002','B0004','2012-05-13',2,234626), (11,'101003','B0003','2001-01-24',3,26243), (12,'101004','B0001','2009-08-23',2,45671); ``` 1. 将数据表deposite中孙杨的存款金额加10000 ``` update deposite set amount =amount+10000 where c_id in(select c_id from customer where name='孙杨'); ``` 1. 将数据表deposite中所属账户为工商银行并且存入日期为2011-04-05的人员的存款金额加1000 ``` update deposite set amount=amount+1000 where dep_date='2011-04-05' and b_id in(select b_id from bank where bank_name='工商银行'); ``` 1. 将数据表deposite中郭海的银行标识改为建设银行 ``` update deposite set b_id=(select b_id from bank where bank_name='建设银行') where c_id in(select c_id from customer where name='郭海'); ``` 1. 查询孙杨的存款信息(显示信息:客户ID,客户姓名,银行名称,存款金额) ``` ## 内连接查询
select customer.c_id,customer.name,bank.bank_name,deposite.amount from deposite inner join customer on customer.c_id=deposite.c_id inner join bank on bank.b_id=deposite.b_id and customer.name='孙杨'; ##表连接查询
select customer.name,customer.c_id,bank.bank_name,deposite.amount from customer,bank,deposite where customer.c_id= deposite.c_id and bank.b_id= deposite.b_id and customer.name='孙杨'; ``` 1. 查询日期为2011-04-05这一天进行过存款的客户ID,客户姓名,银行名称,存款金额 ``` 方法(1):内连接查询: select customer.c_id,customer.name,bank.bank_name,deposite.amount from deposite inner join customer on customer.c_id= deposite.c_id inner join bank on bank.b_id=deposite.b_id and deposite.dep_date='2011-04-05'; 方法(2):表连接查询: select customer.name,customer.c_id,bank.bank_name,deposite.amount from deposite,customer,bank where deposite.dep_date='2011-04-05'
and customer.c_id= deposite.c_id and bank.b_id= deposite.b_id; ``` 1. 查询郭海在工商银行的存款信息(显示信息:客户ID,客户姓名,银行标识,银行名称,存款日期,存款金额) ``` 方法(1):内连接查询: select customer.c_id,customer.name,bank.b_id ,bank.bank_name, deposite.amount,deposite.dep_date from deposite inner join customer on customer.c_id= deposite.c_id inner join bank on bank.b_id=deposite.b_id and customer.name='郭海' and bank.bank_name='建设银行'; 方法(2):表连接查询: select customer.c_id,customer.name,bank.b_id ,bank.bank_name, deposite.amount,deposite.dep_date from deposite,bank,customer where customer.c_id= deposite.c_id and bank.b_id=deposite.b_id and customer.name='郭海' and bank.bank_name='建设银行'; ``` 1. 查询工商银行存款大于等于一万的客户姓名(使用表链接和子查询两种方式实现) ``` 方法(1):子查询: select customer.name FROM customer WHERE c_id in ( select c_id from deposite WHERE amount in (select amount from deposite WHERE amount>1000 and b_id IN (select b_id from bank where bank_name='工商银行'))); 方法(2):表连接查询: select customer.name from deposite,bank,customer where customer.c_id= deposite.c_id and bank.b_id=deposite.b_id where amount>10000 AND bank_name='工商银行'; 方法(3):内连接查询: select customer.name from deposite inner join customer on customer.c_id= deposite.c_id inner join bank on bank.b_id=deposite.b_id where amount>10000 AND bank_name='工商银行'; ``` 1. 查询在农业银行存款前五名的客户存款信息(显示信息:客户姓名,银行名称,存款金额) ``` 方法(1):内连接查询: select customer.name,bank.bank_name,deposite.amount from deposite inner join customer on customer.c_id= deposite.c_id inner join bank on bank.b_id=deposite.b_id where bank_name='农业银行' ORDER BY amount DESC LIMIT 5; 方法(2):表连接查询: select customer.name,bank.bank_name,deposite.amount from deposite,bank,customer where customer.c_id= deposite.c_id and bank.b_id=deposite.b_id and bank_name='农业银行' ORDER BY amount DESC LIMIT 5; ``` 1. .查询姓“卢”的客户的存款信息(显示信息:客户姓名,银行名称,存款金额) ``` 方法(1):内连接查询: select customer.name,bank.bank_name,deposite.amount from deposite inner join customer on customer.c_id= deposite.c_id inner join bank on bank.b_id=deposite.b_id where name LIKE '卢%'; 方法(2):表连接查询: select customer.name,bank.bank_name,deposite.amount from deposite,bank,customer where customer.c_id= deposite.c_id and bank.b_id=deposite.b_id AND name LIKE '卢%'; ``` 1. 创建存储过程update_salary,更新customer表的salary属性,将salary低于5000的客户的salary变为原来的2倍. ``` create procedure update_salary() update customer set salary = salary * 2 where salary < 5000; ```