从自身更新滚动平均值表-Java 学习之路

我正在尝试使用滚动平均计算更新临时表（MS Access 2010.）

作为一个选择查询，这可以计算3个月的滚动平均值，但速度很慢，所以我宁愿只在必要时存储和更新这些值：

SELECT tempQORDistGrouped.Type, tempQORDistGrouped.Supplier, tempQORDistGrouped.DepBkMo, tempQORDistGrouped.Amt, tempQORDistGrouped.Brands, tempQORDistGrouped.T2, tempQORDistGrouped.Brand, (select avg(rolavg.Amt) from tempQORDistGrouped as rolavg 
  where rolavg.Type = tempQORDistGrouped.Type
  and rolavg.Supplier = tempQORDistGrouped.Supplier
  and rolavg.Brands = tempQORDistGrouped.Brands
  and rolavg.Brand = tempQORDistGrouped.Brand
  and rolavg.DepBkMo between dateadd("m",-2,tempQORDistGrouped.DepBkMo) and tempQORDistGrouped.depbkmo) AS AvgAmt
FROM tempQORDistGrouped;

我已经尝试过下面的更新查询，但我认为我的内部联接语法很糟糕，因为它不会将x1.Type识别为有效字段（我是否需要将这些作为内部联接字段的一部分而不是在where子句中包含??）：

UPDATE tempQORDistGrouped AS x1 
INNER JOIN (SELECT itmID,  avg(Amt) AS RolAvg
  FROM tempQORDistGrouped 
  WHERE tempQORDistGrouped.Type = x1.Type
  AND tempQORDistGrouped.Brand = x1.Brand
  AND tempQORDistGrouped.Brands = x1.Brands
  AND tempQORDistGrouped.T2 = x1.T2
  AND tempQORDistGrouped.DepBkMo between dateadd("m",-2,x1.DepBkMo) and x1.DepBkMo 
  GROUP BY itmID
  ) AS x2
ON x1.itmID = x2.itmID
SET x1.3MonthRollingAmt = x2.RolAvg;

干杯

1 回答

未经测试但应该工作 . 我正在进行列级查询以计算 AVG ，然后将其映射回其余列

试试这个：

UPDATE tempQORDistGrouped AS x1
INNER JOIN (
    SELECT itmID
        , (
            SELECT avg(Amt) amt
            FROM tempQORDistGrouped x4
            WHERE x4.Type = x3.Type
                AND x4.Brand = x3.Brand
                AND x4.Brands = x3.Brands
                AND x4.T2 = x3.T2
                AND x4.DepBkMo BETWEEN dateadd("m", - 2, x3.DepBkMo) AND x3.DepBkMo
            ) AS RolAvg
        , x3.Brand
        , x3.Brands
        , x3.DepBkMo
        , x3.T2
    FROM tempQORDistGrouped x3
    ) AS x2
    ON x1.itmID = x2.itmID
        AND x1.Brand = x2.Brand
        AND x1.Brands = x2.Brands
        AND x1.T2 = x2.T2
        AND x1.DepBkMo BETWEEN dateadd("m", - 2, x2.DepBkMo) AND x2.DepBkMo    
SET x1.3MonthRollingAmt = x2.RolAvg;

回复于 2024-04-29T23:40:55+08:00

从自身更新滚动平均值表

1 回答

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