SQL联接返回重复的条目

首先我要说的是，我是SQL新手，我所写的都是基于教程（我也在使用SQL Server 2012）。我遇到的问题是，我试图从4个不同的表中获取数据，并将它们放入1个表中，以便Access访问。但是，如果某个值与其他值不同，我会不断得到重复的结果。 这些桌子看起来像

第1单元

细胞2

第三单元

第四单元

我的代码是

Alter Procedure [dbo].[spSingleData](
@LotNum varchar(50)
)
AS
Truncate Table dbo.SingleSheet
Begin
Insert INTO dbo.SingleSheet (SerialNum, Cell1PF, Cell2Pf, Cell3PF, Cell4PF)
Select Distinct Cell1.SerialNum, Cell1.PF, Cell2.PF, Cell3.PF, Cell4.PF
From dbo.Cell1
Left Join Cell2 On Cell1.LotNum=Cell2.LotNum
Left Join Cell3 On Cell1.LotNum=Cell3.LotNum
Left Join Cell4 On Cell1.LotNum=Cell4.LotNum
Where Cell1.LotNum = @LotNum
Order by SerialNum
End

PassFail可以是0、1或NULL，但是，就像上面的示例一样，如果其中一个PassFail与其余的不同，则结果表返回

|1234|   1|   1|   1|    0|
|1234|   1|   1|   1|    1|
|2345|   1|   1|   1|    0|
|2345|   1|   1|   1|    1|
|3456|   1|   1|   1|    0|
|3456|   1|   1|   1|    1|
|4567|   1|   1|   1|    0|
|4567|   1|   1|   1|    1|

---

我只是使用了错误的连接，还是应该使用其他连接？

这就是您试图实现的目标：

如果是这样，则在

SerialNum

上缺少

JOIN

谓词，并且不需要

DISTINCT

样本数据：

IF OBJECT_ID('tempdb..#Cell1') IS NOT NULL
DROP TABLE #Cell1
CREATE TABLE #Cell1 (LotNum varchar(10),SerialNum int,PassFail bit)
INSERT INTO #Cell1
VALUES
('Lot11',1234,1),
('Lot11',2345,1),
('Lot11',3456,1),
('Lot11',4567,1)

IF OBJECT_ID('tempdb..#Cell2') IS NOT NULL
DROP TABLE #Cell2
CREATE TABLE #Cell2 (LotNum varchar(10),SerialNum int,PassFail bit)
INSERT INTO #Cell2
VALUES
('Lot11',1234,1),
('Lot11',2345,1),
('Lot11',3456,1),
('Lot11',4567,1)

IF OBJECT_ID('tempdb..#Cell3') IS NOT NULL
DROP TABLE #Cell3
CREATE TABLE #Cell3 (LotNum varchar(10),SerialNum int,PassFail bit)
INSERT INTO #Cell3
VALUES
('Lot11',1234,1),
('Lot11',2345,1),
('Lot11',3456,1),
('Lot11',4567,1)

IF OBJECT_ID('tempdb..#Cell4') IS NOT NULL
DROP TABLE #Cell4
CREATE TABLE #Cell4 (LotNum varchar(10),SerialNum int,PassFail bit)
INSERT INTO #Cell4
VALUES
('Lot11',1234,1),
('Lot11',2345,1),
('Lot11',3456,1),
('Lot11',4567,0)

查询：

SELECT #Cell1.SerialNum,
       #Cell1.PassFail,
       #Cell2.PassFail,
       #Cell3.PassFail,
       #Cell4.PassFail
FROM #Cell1
     LEFT JOIN #Cell2 ON #Cell1.LotNum = #Cell2.LotNum AND #Cell1.SerialNum = #Cell2.SerialNum
     LEFT JOIN #Cell3 ON #Cell1.LotNum = #Cell3.LotNum AND #Cell1.SerialNum = #Cell3.SerialNum
     LEFT JOIN #Cell4 ON #Cell1.LotNum = #Cell4.LotNum AND #Cell1.SerialNum = #Cell4.SerialNum
ORDER BY SerialNum;

结果:

Alter Procedure [dbo].[spSingleData](
@LotNum varchar(50)
)
AS
Truncate Table dbo.SingleSheet
Begin
Insert INTO dbo.SingleSheet (SerialNum, Cell1PF, Cell2Pf, Cell3PF, Cell4PF)
Select Distinct Cell1.SerialNum, Cell1.PF, Cell2.PF, Cell3.PF, Cell4.PF
From dbo.Cell1
Left Join Cell2 On Cell1.LotNum=Cell2.LotNum
Left Join Cell3 On Cell1.LotNum=Cell3.LotNum
Left Join Cell4 On Cell1.LotNum=Cell4.LotNum
Where Cell1.LotNum = @LotNum
Order by SerialNum
End

|1234|   1|   1|   1|    0|
|1234|   1|   1|   1|    1|
|2345|   1|   1|   1|    0|
|2345|   1|   1|   1|    1|
|3456|   1|   1|   1|    0|
|3456|   1|   1|   1|    1|
|4567|   1|   1|   1|    0|
|4567|   1|   1|   1|    1|

IF OBJECT_ID('tempdb..#Cell1') IS NOT NULL
DROP TABLE #Cell1
CREATE TABLE #Cell1 (LotNum varchar(10),SerialNum int,PassFail bit)
INSERT INTO #Cell1
VALUES
('Lot11',1234,1),
('Lot11',2345,1),
('Lot11',3456,1),
('Lot11',4567,1)

IF OBJECT_ID('tempdb..#Cell2') IS NOT NULL
DROP TABLE #Cell2
CREATE TABLE #Cell2 (LotNum varchar(10),SerialNum int,PassFail bit)
INSERT INTO #Cell2
VALUES
('Lot11',1234,1),
('Lot11',2345,1),
('Lot11',3456,1),
('Lot11',4567,1)

IF OBJECT_ID('tempdb..#Cell3') IS NOT NULL
DROP TABLE #Cell3
CREATE TABLE #Cell3 (LotNum varchar(10),SerialNum int,PassFail bit)
INSERT INTO #Cell3
VALUES
('Lot11',1234,1),
('Lot11',2345,1),
('Lot11',3456,1),
('Lot11',4567,1)

IF OBJECT_ID('tempdb..#Cell4') IS NOT NULL
DROP TABLE #Cell4
CREATE TABLE #Cell4 (LotNum varchar(10),SerialNum int,PassFail bit)
INSERT INTO #Cell4
VALUES
('Lot11',1234,1),
('Lot11',2345,1),
('Lot11',3456,1),
('Lot11',4567,0)

SELECT #Cell1.SerialNum,
       #Cell1.PassFail,
       #Cell2.PassFail,
       #Cell3.PassFail,
       #Cell4.PassFail
FROM #Cell1
     LEFT JOIN #Cell2 ON #Cell1.LotNum = #Cell2.LotNum AND #Cell1.SerialNum = #Cell2.SerialNum
     LEFT JOIN #Cell3 ON #Cell1.LotNum = #Cell3.LotNum AND #Cell1.SerialNum = #Cell3.SerialNum
     LEFT JOIN #Cell4 ON #Cell1.LotNum = #Cell4.LotNum AND #Cell1.SerialNum = #Cell4.SerialNum
ORDER BY SerialNum;