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T-SQL外部联接不工作

self-join tsql

0

jp2code · 技术社区 · 16 年前

我有一个使用join编写的查询,它使用部件的序列号显示摘要。

显然,它不起作用!

使用此处的直接搜索:

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,对于这一个零件号,有两(2)个测试需要结果。

现在到我创建的不起作用的查询:

第一个版本将返回一记录:

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)))

产量

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

我猜想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。对吗?

我修改了上面的查询,希望返回最新的记录,但此版本不返回任何内容:

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)))

产量

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

有人能指出我怎样才能让这个查询返回我想要的单一结果吗?

2 回复 | 直到 16 年前

1

0

Will A 16 年前

我认为你想要每个部件的最新测试结果记录是对的吗?

退房 ROW_NUMBER() OVER (PARTITION BY... ORDER BY ...) 在msdn文档中,假设您使用的是mssql 2005或更高版本,这将使它变得非常简单。

2

0

jp2code 16 年前

好的,我已经找到了调整代码以产生我想要的结果的方法。

首先,我使用的数据如下:

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(2)个非常相似的查询。事实证明,我在 LEFT OUTER JOIN 子句需要在 WHERE 条款。

以下是我如何提取第一通过结果和日期:

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))
)

以下是我如何提取第一试验结果和日期:

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))
)

我希望其他人觉得这有用!

乔