2020-11-04

sql中使用触发器

create  database  sale
go
use   sale
go
create table goods
(
id  int primary  key   identity(1,1),
name   varchar(20)  not  null,
count  int   check(count>=0)
)

create  table  sale
(
id  int primary key identity(1,1),
gid  int references goods(id),
time datetime default(getdate()),
count int check(count>0)
)

insert   into  goods  values('宝马',10)
go

select * from goods

go
create trigger salegoods
on  sale for insert
as
declare  @gid int,@count int 
select @gid=gid,@count=COUNT from inserted
update  goods set [email protected] where [email protected]
go

select  * from  goods

select  *   from  sale

insert into sale values (1,getdate(),1);