Sql s_BOA_曲线bc在fc.RunDate=bc.RunDate上 和fc.BM_Unit_Name=bc.BM_Unit_Name 其中fc.BM_Unit_Name='T_DRAXX-1' 分组 fc.BM\u单位名称 ，fc.RunDate ，fc.

s_BOA_曲线bc在fc.RunDate=bc.RunDate上 和fc.BM_Unit_Name=bc.BM_Unit_Name 其中fc.BM_Unit_Name='T_DRAXX-1' 分组 fc.BM\u单位名称 ，fc.RunDate ，fc.期间

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谢谢你的帖子-我已经尝试过这种方法，并在分组讨论问题时脱颖而出。我很乐意发布一个示例数据集/访问文件，如果这样做的话。实际上，我认为康拉德（以下）的方法是一个更好的主意；这是我第一次使用CTE，所以我的耳朵后面有点绿，但我会看一看。这非常好用——我想我和我的原版非常接近，你已经把它弄到手了。谢谢你的帮助

BM_UNIT_NAME   RunDate               Period  FPN (or BOA)
T_DRAXX-1      2010-12-01 00:03:00   1       497

SELECT 
dbo_BMReports_FPN_Curves.BM_Unit_Name, 
dbo_BMReports_FPN_Curves.RunDate, 
dbo_BMReports_FPN_Curves.Period, 
dbo_BMReports_FPN_Curves.PN_Level, 

IIf(IIf(Min([dbo_BMReports_BOA_Curves]![PN_Level]) <[dbo_BMReports_FPN_Curves]![PN_Level],Min([dbo_BMReports_BOA_Curves]! [PN_Level]),Max([dbo_BMReports_BOA_Curves]![PN_Level])) Is Null, [dbo_BMReports_FPN_Curves]![PN_Level],
IIf(Min([dbo_BMReports_BOA_Curves]![PN_Level])<[dbo_BMReports_FPN_Curves]! [PN_Level],Min([dbo_BMReports_BOA_Curves]! [PN_Level]),Max([dbo_BMReports_BOA_Curves]![PN_Level]))) AS BOA

FROM dbo_BMReports_FPN_Curves LEFT JOIN dbo_BMReports_BOA_Curves ON  (dbo_BMReports_FPN_Curves.RunDate = dbo_BMReports_BOA_Curves.RunDate) AND  (dbo_BMReports_FPN_Curves.BM_Unit_Name = dbo_BMReports_BOA_Curves.BM_Unit_Name)

GROUP BY dbo_BMReports_FPN_Curves.BM_Unit_Name, dbo_BMReports_FPN_Curves.RunDate, dbo_BMReports_FPN_Curves.Period, dbo_BMReports_FPN_Curves.PN_Level

HAVING (((dbo_BMReports_FPN_Curves.BM_Unit_Name)='T_DRAXX-1'));

SELECT 
BMReports_FPN_Curves.BM_Unit_Name, 
BMReports_FPN_Curves.RunDate, 
BMReports_FPN_Curves.Period,
AVG(BMReports_FPN_Curves.PN_Level) AS FPN,

    CASE
      WHEN BMReports_BOA_Curves.PN_Level IS NULL THEN AVG(BMReports_FPN_Curves.PN_Level)
      WHEN MIN(BMReports_BOA_Curves.PN_Level) IS <  AVG(BMReports_FPN_Curves.PN_Level) THEN MIN(BMReports_BOA_Curves.PN_Level)
      ELSE MAX(BMReports_BOA_Curves.PN_Level)
    END AS BOA

FROM BMReports_FPN_Curves 
  LEFT JOIN BMReports_BOA_Curves ON BMReports_FPN_Curves.BM_Unit_Name = BMReports_BOA_Curves.BM_Unit_Name
  AND  BMReports_FPN_Curves.RunDate = BMReports_BOA_Curves.RunDate

GROUP BY BMReports_FPN_Curves.BM_Unit_Name, BMReports_FPN_Curves.RunDate, BMReports_FPN_Curves.Period
HAVING BMReports_FPN_Curves.BM_Unit_Name = 'T_DRAXX-1'
ORDER BY BMReports_FPN_Curves.BM_Unit_Name, BMReports_FPN_Curves.RunDate, BMReports_FPN_Curves.Period

IIf
(
    IIf
    (
        Min([dbo_BMReports_BOA_Curves]![PN_Level]) < [dbo_BMReports_FPN_Curves]![PN_Level], 
        Min([dbo_BMReports_BOA_Curves]![PN_Level]),
        Max([dbo_BMReports_BOA_Curves]![PN_Level])
    ) Is Null,
    [dbo_BMReports_FPN_Curves]![PN_Level],
    IIf
    (
        Min([dbo_BMReports_BOA_Curves]![PN_Level]) < [dbo_BMReports_FPN_Curves]![PN_Level],
        Min([dbo_BMReports_BOA_Curves]![PN_Level]),
        Max([dbo_BMReports_BOA_Curves]![PN_Level])
    )
) AS BOA

(
case
    when 
        (
        case
            when Min(BMReports_BOA_Curves.PN_Level) < BMReports_FPN_Curves.PN_Level then
                Min(BMReports_BOA_Curves.PN_Level)
            else
                Max(BMReports_BOA_Curves.PN_Level)
        end
        ) is null then
        BMReports_FPN_Curves.PN_Level
    else
        (
            case
                when Min(BMReports_BOA_Curves.PN_Level) < BMReports_FPN_Curves.PN_Level then
                    Min(BMReports_BOA_Curves.PN_Level)
                else
                    Max(BMReports_BOA_Curves.PN_Level)
            end
        )
end
) as BOA

WITH cte 
     AS (SELECT bmreports_fpn_curves.bm_unit_name, 
                bmreports_fpn_curves.rundate, 
                bmreports_fpn_curves.period, 
                AVG(bmreports_fpn_curves.pn_level) AS fpn, 
                AVG(bmreports_fpn_curves.pn_level) AS boa, 
                MIN(bmreports_boa_curves.pn_level) minboa, 
                MAX(bmreports_fpn_curves.pn_level) maxfpn 
         FROM   bmreports_fpn_curves 
                LEFT JOIN bmreports_boa_curves 
                  ON bmreports_fpn_curves.bm_unit_name = 
                     bmreports_boa_curves.bm_unit_name 
                     AND bmreports_fpn_curves.rundate = 
                         bmreports_boa_curves.rundate 
         GROUP  BY bmreports_fpn_curves.bm_unit_name, 
                   bmreports_fpn_curves.rundate, 
                   bmreports_fpn_curves.period 
         HAVING bmreports_fpn_curves.bm_unit_name = 'T_DRAXX-1') 
SELECT bm_unit_name, 
       rundate, 
       period ,
       CASE 
              WHEN BOA IS NULL THEN FPN 
              WHEN BOA < FPN THEN MinBoa
              WEHN BOA > FPN THEN MaxBoa
              ELSE -- BOA = FPN THEN WHAT?
       END as BOA
FROM   cte 

SELECT bm_unit_name, 
       rundate, 
       period ,
       CASE 
              WHEN BOA IS NULL THEN FPN 
              WHEN BOA < FPN THEN MinBoa
              WEHN BOA > FPN THEN MaxBoa
              ELSE -- BOA = FPN THEN WHAT?
       END as BOA
  FROM (
       SELECT bmreports_fpn_curves.bm_unit_name, 
                bmreports_fpn_curves.rundate, 
                bmreports_fpn_curves.period, 
                AVG(bmreports_fpn_curves.pn_level) AS fpn, 
                AVG(bmreports_fpn_curves.pn_level) AS boa, 
                MIN(bmreports_boa_curves.pn_level) minboa, 
                MAX(bmreports_fpn_curves.pn_level) maxfpn 
         FROM   bmreports_fpn_curves 
                LEFT JOIN bmreports_boa_curves 
                  ON bmreports_fpn_curves.bm_unit_name = 
                     bmreports_boa_curves.bm_unit_name 
                     AND bmreports_fpn_curves.rundate = 
                         bmreports_boa_curves.rundate 
         GROUP  BY bmreports_fpn_curves.bm_unit_name, 
                   bmreports_fpn_curves.rundate, 
                   bmreports_fpn_curves.period 
         HAVING bmreports_fpn_curves.bm_unit_name = 'T_DRAXX-1')   ) t

SELECT  fc.BM_Unit_Name
        , fc.RunDate
        , fc.Period
        , CASE 
          WHEN AVG(bc.PN_Level) IS NULL THEN AVG(fc.PN_Level)             -- No BOA Value, use the FPN Value
          WHEN MIN(bc.PN_Level) < AVG(fc.PN_Level) THEN MIN(bc.PN_Level) -- BOA Value is less than the FPN, use the BOA Value
          ELSE MAX(bc.PN_Level)                                          -- BOA Value is greater than the FPN, use the BOA Value
          END 
FROM    dbo.BMReports_FPN_Curves fc
        LEFT JOIN dbo.BMReports_BOA_Curves bc ON fc.RunDate = bc.RunDate        
                                                 AND fc.BM_Unit_Name = bc.BM_Unit_Name
WHERE   fc.BM_Unit_Name ='T_DRAXX-1'
GROUP BY
        fc.BM_Unit_Name
        , fc.RunDate
        , fc.Period