Tsql T-SQL外部联接不起作用

我使用连接编写了一个查询，以显示使用部件序列号的摘要

显然，它不起作用

在此处使用直接搜索：

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%'

我得到以下示例输出：

注意，对于这个零件号，我需要两个测试的结果

现在转到我创建的不起作用的查询：

此第一个版本将返回一条记录：

我猜上面的查询会产生一个结果，因为有两个或多个记录可供比较。对吧?

我修改了上面的查询，希望返回最新的记录，但是这个版本没有返回任何内容：

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)))

---

有人能指出我如何让这个查询返回我想要的单个结果吗？

我认为您想要每个零件的最新测试结果记录，对吗

---

如果您使用的是MSSQL 2005或更高版本，请查看MSDN文档，这将使其变得非常简单。

好的，我已经找到了调整代码以产生所需结果的方法

首先，以下是我使用的数据：

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，我创建了两个非常相似的查询。事实证明，我在LEFT-OUTER-JOIN子句中提出的要求需要在WHERE子句中模仿

以下是我如何提取第一次通过结果和日期：

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))
)

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))
)

以下是我如何提取第一个测试结果和日期：

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%') 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))
)

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))
)

我希望其他人觉得这很有用

---

~Joe

正如@Will A所问的，你的目标是什么？要获取每个零件的最新测试结果？无法查看。这项工作使用的是Microsoft ISA代理服务器，我们的网络管理员不知道如何让它通过MSDN页面。他们总是超时。老鼠。我们还坚持使用SQL Server 2000 Enterprise。@jp2code-您的工作块msdn？那真是一份多么糟糕的工作啊。当然，老板，如果我能使用msdn文档的话，我可以让它工作，这本应该是上周完成的。现在我必须回家看看msdn才能完成任务@JonH-work不会主动阻止MSDN，但我们的网络管理员看不到让我们的Microsoft ISA代理服务器通过站点的方法-尤其是如果我使用我的MSDN帐户登录。Msg 195，级别15，状态10:“row_number”不是可识别的函数名。首先，我坚持使用SQLServer2000企业版。第二，你的暗示仍然没有告诉我如何解决我的问题。我的逻辑似乎在那里。然而，我不知道使用您的行号会有什么帮助-即使我可以使用它。

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))
)

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))
)