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

/* 求表并集

1

2

3

4

5*/

select * from t1 union all select * from t2

go

/*求表并集不过滤重复

1

2

3

3

4

5*/

select * from t1 except select * from t2

go

/*求t1对t2的差集

1

2*/

select * from t1 intersect select * from t2

go

/*求t1对t2的交集

3*/