SQL查询返回两个表之间的差异

我试图比较两个表，SQL Server，以验证一些数据。我想从两个表中返回数据在其中一个或另一个中的所有行。本质上，我想展示所有的差异。我需要检查这样做的三段数据，FirstName, LastName和产品。

我对SQL相当陌生，似乎我找到的很多解决方案都过于复杂了。我不需要担心null。

我是这样开始的:

SELECT DISTINCT [First Name], [Last Name], [Product Name] FROM [Temp Test Data]
WHERE ([First Name] NOT IN (SELECT [First Name] 
FROM [Real Data]))

不过我很难继续下去。

谢谢!

编辑:

基于@treaschf的回答，我一直在尝试使用以下查询的变体:

SELECT td.[First Name], td.[Last Name], td.[Product Name]
FROM [Temp Test Data] td FULL OUTER JOIN [Data] AS d 
ON td.[First Name] = d.[First Name] AND td.[Last Name] = d.[Last Name] 
WHERE (d.[First Name] = NULL) AND (d.[Last Name] = NULL)

但是我总是得到0结果，当我知道td中至少有1行不是在d中。

编辑:

好吧，我想我明白了。至少在我几分钟的测试中，它似乎工作得足够好。

SELECT [First Name], [Last Name]
FROM [Temp Test Data] AS td
WHERE (NOT EXISTS
        (SELECT [First Name], [Last Name]
         FROM [Data] AS d
         WHERE ([First Name] = td.[First Name]) OR ([Last Name] = td.[Last Name])))

这基本上会告诉我测试数据中哪些是真实数据中没有的。这完全可以满足我的需求。

当前回答

对于一个简单的冒烟测试，你试图确保两个表匹配w/out担心列名:

--ensure tables have matching records
Select count (*) from tbl_A
Select count (*) from tbl_B

--create temp table of all records in both tables
Select * into #demo from tbl_A 
Union All
Select * from tbl_B

--Distinct #demo records = Total #demo records/2 = Total tbl_A records = total tbl_B records
Select distinct * from #demo

您可以很容易地编写一个存储过程来比较一批表。

2013-11-22 16:40:27

其他回答

要获得两个表之间的所有差异，你可以像我这样使用SQL请求:

SELECT 'TABLE1-ONLY' AS SRC, T1.*
FROM (
      SELECT * FROM Table1
      EXCEPT
      SELECT * FROM Table2
      ) AS T1
UNION ALL
SELECT 'TABLE2-ONLY' AS SRC, T2.*
FROM (
      SELECT * FROM Table2
      EXCEPT
      SELECT * FROM Table1
      ) AS T2
;

2015-12-07 09:42:37

这将做的技巧，类似于Tiago的解决方案，返回“源”表以及。

select [First name], [Last name], max(_tabloc) as _tabloc
from (
  select [First Name], [Last name], 't1' as _tabloc from table1
  union all
  select [First name], [Last name], 't2' as _tabloc from table2
) v
group by [Fist Name], [Last name]
having count(1)=1

结果将包含表之间的差异，在列_tabloc中，您将有表引用。

2014-11-02 01:53:50

试试这个:

SELECT 
    [First Name], [Last Name]
FROM 
    [Temp Test Data] AS td EXCEPTION JOIN [Data] AS d ON 
         (d.[First Name] = td.[First Name] OR d.[Last Name] = td.[Last Name])

读起来简单多了。

2010-01-16 19:48:08

(   SELECT * FROM table1
    EXCEPT
    SELECT * FROM table2)  
UNION ALL
(   SELECT * FROM table2
    EXCEPT
    SELECT * FROM table1)

2010-01-16 15:50:31

对于一个简单的冒烟测试，你试图确保两个表匹配w/out担心列名:

--ensure tables have matching records
Select count (*) from tbl_A
Select count (*) from tbl_B

--create temp table of all records in both tables
Select * into #demo from tbl_A 
Union All
Select * from tbl_B

--Distinct #demo records = Total #demo records/2 = Total tbl_A records = total tbl_B records
Select distinct * from #demo

您可以很容易地编写一个存储过程来比较一批表。

2013-11-22 16:40:27

SQL查询返回两个表之间的差异

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