EXCEPT

IF OBJECT_ID('[A]') IS NOT NULL
 DROP TABLE [A]
 GO
 CREATE TABLE  [A] ([id] [int],[name] [nvarchar](10),[yoyo] [nvarchar](10))
 INSERT INTO  [A]SELECT '2','name2','x张三' union all
   SELECT '3','name2','李四' union all
   SELECT '2','name3','李四'
 IF OBJECT_ID('[B]') IS NOT NULL 
   DROP TABLE [B]
   GO
   CREATE TABLE  [B] ([id] [int],[name] [nvarchar](10),[yoyo] [nvarchar](10))
   INSERT INTO  [B] SELECT '2','name2','张三' UNION  ALL
   SELECT '2','name2','李四' union all
   SELECT '2','name3','李四'
  
   -->SQL查询如下:
  select * from A
  select * from B
 select * from (
   SELECT * FROM ( SELECT  'B表' AS 表名,  id FROM [B] EXCEPT  SELECT 'B表' AS 表名,  id FROM [A] ) a
   UNION ALL
   SELECT * FROM ( SELECT  'A表' AS 表名,  id FROM [A] EXCEPT  SELECT 'A表' AS 表名,  id FROM [B] ) b
   ) c
   /*表名 id name yoyo---- ----------- ---------- ----------B表 3 name3 李四(1 行受影响)*/
  
  
  
  

IF OBJECT_ID('[A]') IS NOT NULL 
 DROP TABLE [A]
 GO
 CREATE TABLE  [A] ([id] [int],[name] [nvarchar](10),[yoyo] [nvarchar](10))
 INSERT INTO  [A]SELECT '2','name2','x张三' union all 
   SELECT '3','name2','李四' union all
   SELECT '2','name3','李四'
 IF OBJECT_ID('[B]') IS NOT NULL  
   DROP TABLE [B]
   GO
   CREATE TABLE  [B] ([id] [int],[name] [nvarchar](10),[yoyo] [nvarchar](10))
   INSERT INTO  [B] SELECT '2','name2','张三' UNION  ALL
   SELECT '2','name2','李四' union all
   SELECT '2','name3','李四'
   
   -->SQL查询如下:
  select * from A 
  select * from B 
 select * from (
   SELECT * FROM ( SELECT  'B表' AS 表名,  id FROM [B] EXCEPT  SELECT 'B表' AS 表名,  id FROM [A] ) a
   UNION ALL
   SELECT * FROM ( SELECT  'A表' AS 表名,  id FROM [A] EXCEPT  SELECT 'A表' AS 表名,  id FROM [B] ) b
   ) c
   /*表名 id name yoyo---- ----------- ---------- ----------B表 3 name3 李四(1 行受影响)*/