create table A(
id int IDENTITY(1,1) Not null primary key,
name varchar(20) not null default(''),
)
INSERT INTO [A]([name]) VALUES('a')
INSERT INTO [A]([name]) VALUES('b')
INSERT INTO [A]([name]) VALUES('c')
INSERT INTO [A]([name]) VALUES('d')
INSERT INTO [A]([name]) VALUES('e')
INSERT INTO [A]([name]) VALUES('f')
INSERT INTO [A]([name]) VALUES('g')
create table B(
id int IDENTITY(1,1) Not null primary key,
name varchar(20) not null default(''),
)
INSERT INTO [B]([name]) VALUES('a')
INSERT INTO [B]([name]) VALUES('b')
INSERT INTO [B]([name]) VALUES('c')
INSERT INTO [B]([name]) VALUES('d')
INSERT INTO [B]([name]) VALUES('h')
INSERT INTO [B]([name]) VALUES('i')
INSERT INTO [B]([name]) VALUES('j')
SELECT * from A union select * from B --查询A\B表的并集重复的项只显示一个
SELECT * from A union all select * from B ----查询A\B表的并集重复的也显示
SELECT * from A union all select * from B order by id asc ---查询A\B表的并集重复的也显示，并按照id升序
SELECT * from A INTERSECT select * from B ----查询两表的交集
SELECT * from A EXCEPT select * from B ----查询A表中不与B表重复的记录
--查询A\B两表中所有非交集的记录
(SELECT * from A EXCEPT select * from B) union (SELECT * from B EXCEPT select * from A)
