select * from members where m_address like '%湖南%';


select p_no, SUM(o_quantity) as total_quantity
from orders group by p_no
having SUM(o_quantity) > 5
order by total_quantity desc;

select m_account,p_no from orders where p_no in (select p_no from orders where m_account = 'Wangym') and m_account != 'Wangym';

create view View1 as
select * from members 
where m_account in (select m_account from orders where p_no = '102');

insert into View1 values ('fengx','冯向','男','北京',5000,'fx');


select m.*, o.o_quantity, o.o_date, o.p_no
from members m 
left join orders o on m.m_account = o.m_account;

update members
set m_password = 'liu'
where m_account = 'liuzc';

insert into members values ('liuzc','翁红','男','湖南株洲','5500','123');

alter table members add constraint m_sex_check check (m_sex in('男','女'));
insert into members values ('liuzh','刘忠怀','工','湖南株洲',3000,'liuzh');

insert into orders values ('Zhou','101',1, '2017-8-9');