SQL Server 中关于EXCEPT和INTERSECT的用法

create table t1(id int,mark char(2))
go
create table t2(id int,mark char(2))
go
insert into t1
    select 1,‘t1‘ union all
    select 2,‘t2‘ union all
    select 3,‘t3‘ union all
    select 4,‘t4‘
go
insert into t2
    select 2,‘t2‘ union all
    select 3,‘m3‘ union all
    select 5,‘m5‘ union all
    select 6,‘t6‘
go
select * from t1
EXCEPT
select * from t2
go
select * from t1
INTERSECT
select * from t2
go

--EXCEPT结果集为
--1    t1
--3    t3
--4    t4

--INTERSECT结果集为
--2    t2