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查找T-SQL以返回这些值

join tsql sql-server sql

Tony Peterson · 技术社区 · 16 年前

我正在尝试编写一个存储过程,它将根据下面的规则为每个记录返回两个计算值,但我还没有弄清楚如何构造SQL来实现它。我正在使用SQL Server 2008。

首先,相关表和与问题相关的字段。

生产运行

 RunID (key, and RunID is given to the stored proc as its parameter)
 ContainerName
 ProductName
 TemplateID

模板测量

 MeasurementTypeID
 TemplateID

简单界限

 MeasurementTypeID
 TemplateID
 UpperBound
 LowerBound

遏制语言

 MeasurementTypeID
 TemplateID
 UpperBound
 LowerBound
 ContainerName

产品界限

 MeasurementTypeID
 TemplateID
 UpperBound
 LowerBound
 ProductName

这就是我想要回来的。我要为每个TemplateMeasurements记录返回一个计算的上限和下限值,该记录具有与具有提供的runid的ProductionRuns记录匹配的TemplateID。

计算出的上界和下界基本上得到了最紧的界,如果它们符合条件,则可以通过简单的、容器的和产品的界得到。

如果simplebounds记录具有正确的measurementtypeid和templateid,则该记录将成为特定measurementtypeid和templatemeasurements记录的限定界限之一。

要使绑定到容器的记录符合条件,templateID和measurementtypeID必须匹配,但containerName也必须与productionruns记录中containerName的值匹配。同样,对于ProductBounds,这也是正确的,但对于ProductName也是如此。

对于特定的measurementtypeid,取所有限定界限,并找到最小上界,这将是要返回的计算上界。找到限定符的最大下界,这就是返回的下界。

但是,我不知道如何将SQL组合在一起来实现这一点。

另外,如果三个绑定表中没有一个符合特定的measurementtypeid,则可以返回空值。

我的想法是某种左外部联接,但我不知道如何将其扩展到三个表,这些表的结果都可能为空。

谢谢你的帮助。

4 回复 | 直到 16 年前

Tom H zenazn 16 年前

我现在没有时间测试这个,但希望这能让你非常接近:

SELECT
     PR.RunID,
     PR.TemplateID,
     CASE
          WHEN MAX(SB.LowerBound) > MAX(CB.LowerBound) AND
                      MAX(SB.LowerBound) > MAX(PB.LowerBound) THEN MAX(SB.LowerBound)
          WHEN MAX(CB.LowerBound) > MAX(PB.LowerBound) THEN MAX(CB.LowerBound)
          ELSE MAX(PB.LowerBound)
     END AS LowerBound,
     CASE
          WHEN MIN(SB.UpperBound) < MIN(CB. UpperBound) AND
                      MIN(SB. UpperBound) < MIN(PB. UpperBound) THEN MIN(SB. UpperBound)
          WHEN MIN(CB. UpperBound) < MIN(PB. UpperBound) THEN MIN(CB. UpperBound)
          ELSE MIN(PB. UpperBound)
     END
FROM
     ProductionRuns PR
INNER JOIN TemplateMeasurements TM ON
      TM.TemplateID = PR.TemplateID
LEFT OUTER JOIN SimpleBounds SB ON
     SB.TemplateID = PR.TemplateID AND
     SB.MeasurementTypeID = TM.MeasurementTypeID
LEFT OUTER JOIN ContainerBounds CB ON
     CB.TemplateID = PR.TemplateID AND
     CB.MeasurementTypeID = TM.MeasurementTypeID AND
     CB.ContainerName = PR.ContainerName
LEFT OUTER JOIN ProductBounds PB ON
     PB.TemplateID = PR.TemplateID AND
     PB.MeasurementTypeID = TM.MeasurementTypeID AND
     PB.ProductName = PR.ProductName
GROUP BY
     PR.RunID,
     PR.TemplateID

Welbog 16 年前

不要忘记汤姆H的回答,但你也可以考虑用工会来解决这个问题,而不是加入工会来帮助划分不同的上/下规则。这取决于您认为将来查询需要如何更改(如果有的话)。

查询最终看起来更干净,尤其是没有所有的事例规则,但在模板度量行不存在的情况下,它可能没有那么有用。

SELECT RunID, TemplateID, MIN(UpperBound), MAX(LowerBound)
FROM

  (SELECT PR.RunID, SB.TemplateID, SB.UpperBound, SB.LowerBound
  FROM SimpleBounds SB
  INNER JOIN TemplateMeasurements TM
      ON  SB.TemplateID = TM.TemplateID
      AND SB.MeasurementTypeID = TM.MeasurementTypeID
  INNER JOIN ProductionRuns PR
      ON  TM.TemplateID = PR.TemplateID)

UNION

  (SELECT PR.RunID, CB.TemplateID, CB.UpperBound, CB.LowerBound
  FROM ContainerBounds CB
  INNER JOIN TemplateMeasurements TM
      ON  CB.TemplateID = TM.TemplateID
      AND CB.MeasurementTypeID = TM.MeasurementTypeID
  INNER JOIN ProductionRuns PR
      ON  TM.TemplateID = PR.TemplateID
      AND CB.ContainerName = PR.ContainerName)

UNION

  (SELECT PR.RunID, PB.TemplateID, PB.UpperBound, PB.LowerBound
  FROM ProductBounds PB
  INNER JOIN TemplateMeasurements TM
      ON  PB.TemplateID = TM.TemplateID
      AND PB.MeasurementTypeID = TM.MeasurementTypeID
  INNER JOIN ProductionRuns PR
      ON  TM.TemplateID = PR.TemplateID
      AND PB.ProductName = PR.ProductName)

GROUP BY RunID, TemplateID

mwigdahl 16 年前

您已经得到了其他应该有效的答案,但在我看来,这种类型的联合内部查询可以以最干净、最可维护的方式将水平层次结构折叠为垂直层次结构,这基本上是您的问题:

SELECT MIN(iq.upperbound), MAX(iq.lowerbound)
FROM TemplateMeasurements tm
    INNER JOIN ProductionRuns pr ON tm.TemplateID = pr.TemplateID
    LEFT JOIN
    (
    SELECT sb.UpperBound, sb.LowerBound, sb.MeasurementTypeID, '' as Name, 'sb' as Type, sb.TemplateID
    FROM SimpleBounds sb 
    UNION ALL
    SELECT cb.UpperBound, cb.LowerBound, cb.MeasurementTypeID, cb.ContainerName as Name, 'cb' as Type, cb.TemplateID
    FROM ContainerBounds cb 
    UNION ALL
    SELECT pb.UpperBound, pb.LowerBound, pb.MeasurementTypeID, pb.ProductName as Name, 'pb' as Type, pb.TemplateID
    FROM ProductBounds pb 
    ) iq ON iq.MeasurementTypeID = tm.MeasurementTypeID 
        AND iq.TemplateID = tm.TemplateID 
        AND iq.Name = 
            CASE iq.Type 
             WHEN 'sb' THEN iq.Name 
             WHEN 'cb' THEN pr.ContainerName 
             WHEN 'pb' THEN pr.ProductName 
            END
    WHERE pr.RunID = @runid
    GROUP BY tm.TemplateID, tm.MeasurementTypeID

Tony Peterson 16 年前

谢谢你带领我走上正确的方向。在我把这个问题调整好之前,我必须先处理一段时间,但现在效果很好。

我的最终代码和结果:

 ALTER PROCEDURE [dbo].[GetBounds]
 @runID int
 AS
 BEGIN
    SET NOCOUNT ON;
    DECLARE @templateID int
    SET @templateID = (SELECT TOP(1) TemplateID 
    FROM ProductionRuns WHERE RunID = @runID);

    SELECT TM.MeasurementTypeID,

    CASE 
    WHEN MIN(SB.UpperBound) < MIN(PB.UpperBound) 
    AND MIN(SB.UpperBound) < MIN(CB.UpperBound) THEN MIN(SB.UpperBound)
    WHEN MIN(PB.UpperBound) < MIN(SB.UpperBound) 
    AND MIN(PB.UpperBound) < MIN(CB.UpperBound) THEN MIN(PB.UpperBound)
    WHEN MIN(CB.UpperBound) < MIN(SB.UpperBound) 
    AND MIN(CB.UpperBound) < MIN(PB.UpperBound) THEN MIN(CB.UpperBound)
    ELSE MIN(SB.UpperBound) 
    END AS 'UpperBound',

    CASE
    WHEN MAX(SB.LowerBound) > MAX(PB.LowerBound) 
    AND MAX(SB.LowerBound) > MAX(CB.LowerBound) THEN MAX(SB.LowerBound)
    WHEN MAX(PB.LowerBound) > MAX(SB.LowerBound) 
    AND MAX(PB.LowerBound) > MAX(CB.LowerBound) THEN MAX(PB.LowerBound)
    WHEN MAX(CB.LowerBound) > MAX(SB.LowerBound) 
    AND MAX(CB.LowerBound) > MAX(PB.LowerBound) THEN MAX(CB.LowerBound)
    ELSE MAX(SB.LowerBound)
    END AS 'LowerBound'

    FROM
    ProductionRuns PR
    INNER JOIN TemplateMeasurements TM ON
    TM.TemplateID = PR.TemplateID
    LEFT OUTER JOIN SimpleBounds SB ON
    SB.TemplateID = PR.TemplateID AND
    SB.MeasurementTypeID = TM.MeasurementTypeID
    LEFT OUTER JOIN ContainerBounds CB ON
    CB.TemplateID = PR.TemplateID AND
    CB.MeasurementTypeID = TM.MeasurementTypeID AND
    CB.ContainerName = PR.ContainerName
    LEFT OUTER JOIN ProductBounds PB ON
    PB.TemplateID = PR.TemplateID AND
    PB.MeasurementTypeID = TM.MeasurementTypeID AND
    PB.ProductName = PR.ProductName 

    WHERE TM.TemplateID = @templateID

    GROUP BY
    TM.MeasurementTypeID
 END

特定案例的部分结果,runid=3249(templateid=2)

MeasurementTypeID   UpperBound  LowerBound
2   NULL    NULL
11  4   2.5
18  30  1
20  40  10
33  99  0
36  200 140
42  120 32
...