mySql 随堂练习

Posted 2020-11-22 11-21

#1创建一个数据库hainan_data

create database if not exists hainan_data;
use hainan_data;

create table contract(
contract_num int,
customer_id int,
name varchar(10),
company varchar(20),
start_time date,
end_time date,
dp_num int,
pl_mun int,
all_buy int);
#drop table contract;

 

#2创建customer表，客户ID为主键,并且插入一些自建数据

create table customer(
id int primary key,
name varchar(10),
company varchar(20),
sales varchar(10));

create table data(
name varchar(10),
company varchar(20),
request_time date,
used_num int);


insert into contract values(01,1,"tom","tomA","2013-05-01","2013-06-05",10,20,30),
(02,2,"jim","jimB","2013-06-01","2013-07-05",20,30,50),
(03,3,"jimmy","jimmyC","2013-07-01","2013-07-31",30,40,70),
(04,4,"sun","sunD","2013-07-11","2013-07-25",40,50,90),
(05,5,"sunny","sunnyE","2013-07-01","2013-07-15",50,50,100),
(06,6,"ann","annF","2013-07-01","2013-07-30",60,70,130);

 

select * from contract;

insert into customer values(1,"tom","tomA","张雪君"),
(2,"jim","jimB","张雪雪"),
(3,"jimmy","jimmyC","严鼎文"),
(4,"sun","sunD","严文文"),
(5,"sunny","sunnyE","鲍海地"),
(6,"ann","annF","鲍海地");
select * from customer;

insert into data values("jim","jimB","2013-06-20",100),
("sun","sunD","2013-07-20",80),
("sunny","sunnyE","2013-07-01",120),
("jimmy","jimmyC","2013-07-10",110),
("tom","tomA","2013-07-20",150),
("ann","annF","2013-07-30",130);

select * from data;

 

#3修改customer表结构，增加一个表字段：公司地址address

alter table customer add address varchar(50);

 

#4删除customer表

drop table customer;

 

#5查询customer表中所有客户的客户名称，要求：客户名称不重复

select distinct name from customer;

 

#6查询“张雪君”和“严鼎文”两名销售人员名下的所有客户的客户名称和公司名称

select name as 客户名称,company as 公司名称 from customer where sales in("张雪君","严鼎文");

 

#7查询客户id在240,367,58,233之中且合同开始时间在“2012-01-01”到“2013-07-31”之间的合同信息

select * from contract 
where customer_id in (2,3,5,6) 
and start_time between "2012-01-01" and "2013-07-31" 
group by contract_num;

 

#8查询销售人员：鲍海地名下的客户信息，并按客户id升序排列

select * from customer where sales="鲍海地" order by id;

 

#9查询销售人员鲍海地名下的合同总份数

select count(contract_num) from contract where customer_id in (select id from customer where sales="鲍海地");

 

#10查询所有客户的购买数量，并按合同编号进行分组

select id,customer.name,sum(all_buy) as 购买数量 from customer left join contract on id=customer_id group by contract_num;

 

#11查询合同表中，购买总量大于等于100万的客户信息

select * from customer left join contract on id=customer_id where all_buy>=100;

 

#12统计每个客户在2013-07-01至2013-07-31 7月份月度使用总量，要求按合同统计

select customer.name,contract_num,sum(used_num) as 月度使用量 from customer 
left join contract on id=customer_id 
left join data on customer.name=data.name 
where request_time between "2013-07-01" and "2013-07-31"
group by contract_num;

 

#13向客户表中添加一条数据（客户id：1，客户名称：test，公司名称：test，销售：test）

insert into customer values (7,"test","test","test");