1交叉联接
--交叉联接
create table toys
(
toy_id int identity primary key not null,
toy varchar(30)
)
create table boys
(
boy_id int not null primary key,
boy varchar(20)
)
insert into toys(toy)values('hula hoop')
insert into toys(toy)values('balsa glider')
insert into toys(toy)values('toy soldiers')
insert into toys(toy)values('harmonica')
insert into toys(toy)values('baseball cards')
insert into boys(boy_id, boy)values(1,'Davey')
insert into boys(boy_id, boy)values(2,'Bobby')
insert into boys(boy_id, boy)values(3,'Beaver')
insert into boys(boy_id, boy)values(4,'Richie')
select t.toy, b.boy from toys t cross join boys b
cross join 返回两张表的每一行相乘的结果。
本文转自鹅倌51CTO博客，原文链接： http://blog.51cto.com/kaixinbuliao/881372，如需转载请自行联系原作者
