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带您深入了解SQL连接查询
发布时间：2025-11-05 07:24:52 来源：创站工坊 作者：数据库
复制create table student ( id int primary key identity(1,入解1), name varchar(50) ) create table grade( id int primary key identity(1,1), score money ) alter table grade add sid int select * from grade alter table grade add constraint fk_sid foreign key(sid) references student(id) insert into student values(哈哈) insert into student values(喜喜) insert into student values(呵呵) insert into student values(郁闷) insert into student values(小强) insert into student values(小马) insert into grade values(90,1) insert into grade values(80,2) insert into grade values(70,null) select * from student select * from grade 1.2.3.4.5.6.7.8.9.10.11.12.13.14.15.16.17.18.19.20.21.22.23.
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