他们的对应关系可以参考下面图示相关测试实例如下：
相关测试实例如下：
复制代码 代码如下:
use tempdb
go
if (object_id ('t1' ) is not null ) drop table t1
if (object_id ('t2' ) is not null ) drop table t2
go
create table t1 (a int )
insert into t1 select 1 union select 2 union select 3
create table t2 (a int )
insert into t2 select 3 union select 4 union select 5
go
select * from t1 union select * from t2
go
select * from t1 union all select * from t2
go
select * from t1 except select * from t2
go
select * from t1 intersect select * from t2
go
