T-SQL外部连接不起作用

我有一个查询，我使用连接编写来显示使用部件的Serial_Number的摘要。T-SQL外部连接不起作用

很明显，它不工作！

使用这里的直接搜索：

select Serial_Number, Op_ID, Date_Time as 'DecayDate', 
    DECAY.System_ID AS 'DecayID', Test_Result as 'DecayResult' 
from Test_Results 
where serial_number='CP21295 1006 09' and system_id like '%decay%'

我得到这个样本输出：

Serial_Number  Op_ID DecayDate    DecayID  DecayResult 
CP21295 1006 09 003468 2009-10-15 06:36:13.643 AA_DECAY_6 FAILED 
CP21295 1006 09 003468 2009-10-05 08:08:38.503 AA_DECAY_6 PASSED

注意有两个（2）试验，我需要这一个部件号的结果。

我们我创建的查询不起作用：

这第一个版本将返回ONE记录：

SELECT LABEL.Serial_Number, 
    DECAY.Op_ID, 
    DECAY.Date_Time AS 'DecayDate', 
    DECAY.System_ID AS 'DecayID', 
    CASE 
    WHEN DECAY.Test_Result LIKE '%fail%' THEN 'FAIL' 
    WHEN DECAY.Test_Result LIKE '%pass%' THEN 'PASS' 
    ELSE NULL 
    END AS 'DecayResult' 
    FROM 
    ACP_Parts AS LABEL 
    LEFT OUTER JOIN (
    SELECT I.Serial_Number, I.Op_ID, I.Date_Time, I.System_ID, I.Test_Result 
     FROM Test_Results I 
    LEFT OUTER JOIN Test_Results O ON (
     I.Serial_Number=O.Serial_Number) AND 
     (O.Date_Time<I.Date_Time) -- AND (O.Serial_Number IS NULL) // didn't work 
    WHERE 
     (I.Test_Result LIKE '%pass%' OR I.Test_Result LIKE '%fail%') AND 
     (I.System_ID like '%decay%') AND 
     (O.Test_Result LIKE '%pass%' OR O.Test_Result LIKE '%fail%') AND 
     (O.System_ID like '%decay%') 
    ) AS DECAY ON 
     (LABEL.Serial_Number=DECAY.Serial_Number) AND 
     (LABEL.Date_Time<DECAY.Date_Time) 
    WHERE 
    (LABEL.Serial_Number IN (
     SELECT DISTINCT Serial_Number 
     FROM ACP_Parts 
     WHERE (Serial_Number IS NOT NULL) AND 
     (DATEADD(yy, - 1, GETDATE()) < Date_Time)))

输出

Serial_Number  DecayOp DecayDate    DecayID    DecayResult 
CP21295 1006 09 003468 2009-10-15 06:36:13.643 AA_DECAY_6   PASS

我猜测上面的查询会产生一个结果，因为有两个或更多的记录要比较。对？

我修改了上面的查询，希望能返回最新的纪录，但是这个版本不返回任何东西：

SELECT LABEL.Serial_Number, 
    DECAY.Op_ID, 
    DECAY.Date_Time AS 'DecayDate', 
    DECAY.System_ID 'DecayID', 
    CASE 
    WHEN DECAY.Test_Result LIKE '%fail%' THEN 'FAIL' 
    WHEN DECAY.Test_Result LIKE '%pass%' THEN 'PASS' 
    ELSE NULL 
    END AS 'DecayResult' 
    FROM 
    ACP_Parts AS LABEL 
    LEFT OUTER JOIN (
    SELECT TOP 1 Serial_Number, Op_ID, Date_Time, System_ID, Test_Result 
    FROM Test_Results 
    WHERE 
     (System_ID like '%decay%') AND 
     (Test_Result LIKE '%pass%' OR Test_Result LIKE '%fail%') 
    ORDER BY Date_Time DESC 
    ) AS DECAY ON 
     (LABEL.Serial_Number=DECAY.Serial_Number) AND 
     (LABEL.Date_Time<DECAY.Date_Time) 
    WHERE 
    (LABEL.Serial_Number IN (
     SELECT DISTINCT Serial_Number 
     FROM ACP_Parts 
     WHERE (Serial_Number IS NOT NULL) AND 
     (DATEADD(yy, - 1, GETDATE()) < Date_Time)))

输出

Serial_Number  DecayOp DecayDate    DecayID    DecayResult 
CP21295 1006 09 NULL NULL     NULL     NULL

莫非有人指出我如何才能使这个查询返回罪结果我后？

来源

2010-07-16 jp2code

正如@ Will A所问，你的目标是什么？要获得（每个）部分的最新测试结果？ – 2010-07-16 21:28:20

是........... – jp2code 2010-07-16 21:31:51

OK，我已经找到方法来调整代码产生我想要的结果。

首先，这里是我使用的数据：

CREATE TABLE JP1 (Serial_Number VarChar(20), Date_Time DateTime, Test_Result VarChar(255)) 
INSERT JP1 VALUES ('T900 09', '2009-10-10 01:15:00.000', 'NO TEST, Failed to Dump') 
INSERT JP1 VALUES ('T901 09', '2009-10-10 01:20:00.000', '(BLUE) PASS (WHITE) FAIL') 

CREATE TABLE JP2 (Serial_Number VarChar(20), Date_Time DateTime, Test_Result VarChar(255)) 
INSERT JP2 VALUES ('T900 09', '2009-10-15 01:15:00.000', 'NO TEST, Failed to Dump') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 02:15:00.000', '(BLUE) PASS (WHITE) FAIL') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 04:25:00.000', 'TEST ABORTED') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 04:59:00.000', '(BLUE) FAIL (WHITE) FAIL') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 05:09:00.000', '(WHITE) NO TEST') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 05:34:00.000', 'B=Pass.,W=FAIL, Final Fill') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 06:06:00.000', 'PASSED PD') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 06:30:00.000', 'TEST ABORTED') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 06:36:00.000', 'PASS') 
INSERT JP2 VALUES ('T900 09', '2009-10-15 06:50:00.000', 'FAIL') 
INSERT JP2 VALUES ('T900 09', '2009-10-05 08:08:00.000', 'NO TEST, Operator cancel')

接下来，我创建了两个（2）非常类似的查询。事实证明，我在LEFT OUTER JOIN条款中提出的要求需要在WHERE条款中模拟。

这里是我提取FIRST PASS结果和日期：

SELECT LABEL.Serial_Number, 
    DECAY.Date_Time AS 'DecayDate', 
    CASE 
    WHEN DECAY.Test_Result LIKE '%fail%' THEN 'FAIL' 
    WHEN DECAY.Test_Result LIKE '%pass%' THEN 'PASS' 
    ELSE NULL 
    END AS 'DecayResult' 
FROM JP1 AS LABEL 
LEFT OUTER JOIN (
    SELECT I.Serial_Number, I.Date_Time, I.Test_Result 
    FROM 
     JP2 AS I 
     LEFT OUTER JOIN JP2 AS O 
     ON 
     (I.Serial_Number=O.Serial_Number) AND 
     ((O.Test_Result LIKE '%pass%') OR (O.Test_Result LIKE '%fail%')) AND -- //Gets First Test! 
     (O.Test_Result NOT LIKE '%NO TEST%') AND 
     (O.Date_Time<I.Date_Time) -- //(selects FIRST pass or fail) 
     -- (I.Date_Time<O.Date_Time) -- //(selects LAST pass or fail) 
    WHERE 
     (I.Test_Result LIKE '%pass%' OR I.Test_Result LIKE '%fail%') AND -- //Gets First Test! 
     (I.Test_Result NOT LIKE '%NO TEST%') AND 
     (O.Serial_Number IS NULL) 
) AS DECAY ON 
(LABEL.Serial_Number=DECAY.Serial_Number) AND 
(LABEL.Date_Time<DECAY.Date_Time) 
WHERE 
(LABEL.Serial_Number IN (
    SELECT DISTINCT Serial_Number 
    FROM JP1 
    WHERE (Serial_Number IS NOT NULL) AND 
    (DATEADD(yy, - 1, GETDATE()) < Date_Time)) 
)

这里是我提取FIRST测试结果和日期：

SELECT LABEL.Serial_Number, 
    DECAY.Date_Time AS 'DecayDate', 
    CASE 
    WHEN DECAY.Test_Result LIKE '%fail%' THEN 'FAIL' 
    WHEN DECAY.Test_Result LIKE '%pass%' THEN 'PASS' 
    ELSE NULL 
    END AS 'DecayResult' 
FROM JP1 AS LABEL 
LEFT OUTER JOIN (
    SELECT I.Serial_Number, I.Date_Time, I.Test_Result 
    FROM 
     JP2 AS I 
     LEFT OUTER JOIN JP2 AS O 
     ON 
     (I.Serial_Number=O.Serial_Number) AND 
     ((O.Test_Result LIKE '%pass%') AND (O.Test_Result NOT LIKE '%fail%')) AND -- //Gets First Pass! 
     (O.Test_Result NOT LIKE '%NO TEST%') AND 
     (O.Date_Time<I.Date_Time) -- //(selects FIRST pass or fail) 
     -- (I.Date_Time<O.Date_Time) -- //(selects LAST pass or fail) 
    WHERE 
     (I.Test_Result LIKE '%pass%' AND I.Test_Result NOT LIKE '%fail%') AND -- //Gets First Pass! 
     (I.Test_Result NOT LIKE '%NO TEST%') AND 
     (O.Serial_Number IS NULL) 
) AS DECAY ON 
(LABEL.Serial_Number=DECAY.Serial_Number) AND 
(LABEL.Date_Time<DECAY.Date_Time) 
WHERE 
(LABEL.Serial_Number IN (
    SELECT DISTINCT Serial_Number 
    FROM JP1 
    WHERE (Serial_Number IS NOT NULL) AND 
    (DATEADD(yy, - 1, GETDATE()) < Date_Time)) 
)

我希望别人找这有用！

〜Joe

来源

2010-07-20 15:16:23 jp2code

我是正确的思维，你要为每个部分的最新test_result记录？

退房ROW_NUMBER() OVER (PARTITION BY... ORDER BY ...)在MSDN文档 - 这将使它令人眼花缭乱的简单 - 假设你使用MSSQL 2005或以上。

来源

2010-07-16 21:24:24

看不到它。工作使用Microsoft ISA代理服务器，我们的网络管理员无法弄清楚如何让它通过MSDN页面。他们总是超时。 – jp2code 2010-07-16 21:31:06

大鼠。我们也坚持使用SQL Server 2000 Enterprise。 – jp2code 2010-07-16 21:32:35

@ jp2code - 你的工作块msdn？真的可能有多糟糕的工作。 “如果我能够使用上周完成的msdn文档，我肯定可以让它工作，现在我必须回家看看msdn才能完成工作！” – JonH 2010-07-16 21:54:52

T-SQL外部连接不起作用

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