MySQL实训_01

1.创建数据库，名称为qfdb;(如果已有，则省略)

create database if not exists qfdb;

 2.创建数据表customer（客户）、deposite（存款）、bank（银行），表结构如下：

-- 创建表customer(客户)，deposite(存款),bank(银行)
create table if not exists customer
    (c_id char(6) not null comment '客户标识',
    name varchar(30) not null comment '客户姓名',
    location varchar(30) comment '工作地点',
    salary decimal(8,2) comment '工资',
    primary key (c_id));
    

-- 创建表bank
create table if not exists bank
    (b_id char(5) not null comment '银行标识',
     bank_name char(30) not null comment '银行名次',
     primary key(b_id)
    );
    
-- 创建表deposite
create table if not exists deposite
    (
    d_id int not null auto_increment comment '存款流水号',
    c_id char(6) not null comment '客户标识',
    b_id char(5) not null comment '银行标识',
    dep_date date comment '存入日期',
    dep_type char(1) comment '存款期限',
    amount decimal(8,2) comment '存款金额',
    primary key (d_id),
    foreign key (c_id) references customer (c_id),
    foreign key (b_id) references bank (b_id)
    );

3.录入数据

  -- 插入customer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'),
  (101005,'谭力','北京','6324');
    
-- 插入bank数据
insert into bank values
    ('B0001','工商银行'),
    ('B0002','建设银行'),
    ('B0003','中国银行'),
    ('B0004','农业银行');
    
    
-- 插入deposite数据
insert into deposite values
    (1,101001,'B0001','2011-04-05',3,42526),
    (2,101002,'B0002','2012-07-15',5,66500),
    (3,101003,'B0003','2010-11-24',1,42366),
    (4,101004,'B0004','2008-03-31',1,62362),
    (5,101001,'B0001','2002-02-07',3,56346),
    (6,101002,'B0002','2004-09-23',3,353626),
    (7,101003,'B0003','2003-12-14',5,36236),
    (8,101004,'B0004','2007-04-21',5,26267),
    (9,101001,'B0001','2011-02-11',1,425456),
    (10,101002,'B0002','2012-05-13',1,234626),
    (11,101003,'B0003','2001-01-24',5,26243),
    (12,101004,'B0004','2009-08-23',3,45671);

4.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.

-- 4.更新customer表的salary属性
update customer set salary=salary*2 where salary < 5000;

5.对deposite表进行统计，按银行统计存款总数，显示为b_id,total.

-- 5．对deposite表进行统计，按银行统计存款总数，显示为b_id,total.
select b_id,sum(amount) as total from deposite group by b_id;

6.对deposite、customer、bank进行查询，查询条件为location在广州、苏州、济南的客户，存款在300000至500000之间的存款记录，显示客户姓名name、银行名称bank_name、存款金额amount.

-- 6．对deposite、customer、bank进行查询，查询条件为location在广州、苏州、济南的客户，
-- 存款在300000至500000之间的存款记录，
-- 显示客户姓名name、银行名称bank_name、存款金额amount.
select name,bank_name,amount from 
  deposite inner join bank on deposite.b_id = bank.b_id inner join customer on deposite.c_id = customer.c_id where customer.location in ('广州','苏州','济南') and deposite.amount between 300000 and 500000;