Question

我正在制作一份报告，根据GenAmps和GenVolts为我提供每个发电机的月费率。如果我的定价表具有GenAmps＃和GenVolt大小，那么它将填充每月费率。如果在我的定价表中找不到GenAmps＃和GenVolts值，有些情况可以在下面看到。当发生这种情况时，我希望MonthlyRate从最接近的GenAmps＃拉出，其中GenVolts值相等，ex（ GenAmps 15， GenVolts KW），这在定价表中找不到，所以我希望它从（ GenAmps 20， GenVolts KW）中提取MonthlyRate

GenAmps GenVolts    PricingGenAmp   PricingGenVolt  MonthRate(160hr)
10       KW           NULL              NULL           NULL
15       KVA          NULL              NULL           NULL

如果他们在定价表中找不到GenAmps＃和GenVolts值，那么这就是我的报告。

GenAmps GenVolts    MonthRate(160hr)
  25      KVA         1251
  20      KW          1251

（见上图来自定价表）。由于这些不在定价表中，我希望10KW从20KW拉出月率，从25KVA拉出15KVA。所以它看起来像这样：

GenAmps GenVolts    PricingGenAmp   PricingGenVolt  MonthRate(160hr)
10       KW           20                KW              1251
15       KVA          25                KVA             1251

当查询正常工作时，它应该看起来像上面的数据。

GenAmps＃的范围是10 - 900，在定价表中找不到。

这是我目前拥有的查询，需要进行修改，以便我可以按照我希望的方式查看数据。

SELECT        TOP (100) PERCENT ContractID, SaleRep, GenAmps, GenVolts, GenPhase, EstRunningHours, MonthlyRate, DeliveryRate, PickupRate, FuelRate, DropCharge, HourlyServiceRate, 
                         CASE WHEN gr.PricingGenAmps IS NULL THEN
                             (SELECT        MAX(GenAmps) AS a1
                               FROM            dbo.GeneratorSizePrices AS a
                               WHERE        (GenAmps < gr.GenAmps) AND a.GenVolts = gr.GenVolts) ELSE gr.PricingGenAmps END AS PricingGenAmp, ISNULL([MonthRate(160hr)],
                             (SELECT        [MonthRate(160hr)]
                               FROM            dbo.GeneratorSizePrices AS b
                               WHERE        (GenAmps =
                                                             (SELECT        MAX(GenAmps) AS a
                                                               FROM            dbo.GeneratorSizePrices
                                                               WHERE        (GenAmps < gr.GenAmps) AND (GenVolts = gr.GenVolts))))) AS Month
FROM            dbo.Elliott_GensRentalRate AS gr
GROUP BY ContractID, SaleRep, GenAmps, GenVolts, GenPhase, EstRunningHours, MonthlyRate, DeliveryRate, PickupRate, FuelRate, DropCharge, HourlyServiceRate, PricingGenAmps, [MonthRate(160hr)]
ORDER BY PricingGenAmps, GenAmps

Answer 1

我不确定在查询的其余部分中发生了什么。但是问题的一部分涉及将行与另一个表中最近的行匹配，可以通过这种方式处理。

select *
from
    dbo.Elliott_GensRentalRate as gr cross apply
    (
        select gsp.*, row_number() over
            (order by abs(gr.GenAmps - gsp.GenAmps), sign(gr.GenAmps - gsp.GenAmps)) as rnk
        from dbo.GeneratorSizePrices as gsp
        where gsp.GenVolts = gr.GenVolts
) as gspr /* GeneratorSizePricesRanked */
where gspr.rnk = 1

cross apply可让我们查看查询外的GenAmps表格中gr的值。当cross apply不可用时，还有其他方法可以实现此目的，但这可能更有效。接下来的关键是将潜在的匹配按差异的绝对值排序，然后只保留最高的那个。

由于你应该处理关系，我使用sign()函数来确定更高或更低的匹配是否是首选匹配。如上所述，它有利于四舍五入。如果出于某种原因可能根本找不到匹配项，也可以使用outer apply。

Answer 2

这应该让你开始。没有所有数据，很难确定。干杯！

IF OBJECT_ID('tempdb..#gens') IS NOT NULL DROP TABLE #gens
IF OBJECT_ID('tempdb..#genPrice') IS NOT NULL DROP TABLE #genPrice

CREATE TABLE #gens(
    GenAmps INT,
    GenVolts VARCHAR (3),
    PricingGenAmp INT null,
    PricingGenVolt VARCHAR (3) null,
    MonthRate DECIMAL (6,2) null)

CREATE TABLE #genPrice(
    GenAmps INT,
    GenVolts VARCHAR (3),
    MonthRate DECIMAL (6,2))

INSERT INTO #gens
VALUES(10,'KW',null,null,null),(15,'KVA',null,null,null)

INSERT INTO #genPrice
VALUES(25,'KVA',1251.00),(20,'KW',1151.00)



SELECT
    g.GenAmps,
    g.GenVolts,
    ISNULL(g.PricingGenAmp,(SELECT MIN(gp.GenAmps) FROM #genPrice gp WHERE g.GenVolts = gp.GenVolts and gp.GenAmps > g.GenAmps)) AS PricingGenAmp,
    ISNULL(g.PricingGenVolt,(SELECT GenVolts FROM #genPrice gp2 WHERE gp2.GenAmps = (SELECT MIN(gp.GenAmps) FROM #genPrice gp WHERE g.GenVolts = gp.GenVolts and gp.GenAmps > g.GenAmps))) as PricingGenVolt,
    ISNULL(g.MonthRate,(SELECT MonthRate FROM #genPrice gp3 WHERE gp3.GenAmps = (SELECT MIN(gp.GenAmps) FROM #genPrice gp WHERE g.GenVolts = gp.GenVolts and gp.GenAmps > g.GenAmps))) as MonthRate
FROM
    #gens g

当其中一个字段为空但您需要值时，查找最近的数字

2 个答案: