sql server中带有case语句的更新查询中的聚合函数

我正在尝试使用聚合函数和case语句编写更新查询。 我是如何被困住的

最初，我编写了以下查询，该查询给了我一个错误：“在update语句中不能使用聚合函数

UPDATE report
SET report.LoadDischargeQty = 
CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'D' AND cargo.CRG_Quantity is NOT NULL THEN cargo.CRG_Quantity 
 ELSE
     CASE WHEN report.PlaId = 'LP' THEN 
                                    CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'D' THEN ISNULL(SUM(CRG_SFgrMT),0) END -  
                                    CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'A' THEN ISNULL(SUM(CRG_SFgrMT),0)END 
         WHEN report.PlaId = 'DP' THEN 
                                    CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'A' THEN ISNULL(SUM(CRG_SFgrMT),0) END-
                                    CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'D' THEN ISNULL(SUM(CRG_SFgrMT),0)END
        ELSE 0 END  
END 
from #CargoPerformanceReport report
INNER JOIN POSCARGO cargo ON cargo.POS_ID = report.PositionId AND ISNULL(cargo.CRG_Deleted,0)=0

所以我重构它如下

UPDATE report
SET report.LoadDischargeQty = 
CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'D' AND cargo.CRG_Quantity is NOT NULL THEN cargo.CRG_Quantity 
 ELSE
    select quantity.dischargeQuantity from (SELECT CASE WHEN report.PlaId = 'LP' THEN 
                                    CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'D' THEN ISNULL(SUM(CRG_SFgrMT),0) END -  
                                    CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'A' THEN ISNULL(SUM(CRG_SFgrMT),0)END 
         WHEN report.PlaId = 'DP' THEN 
                                    CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'A' THEN ISNULL(SUM(CRG_SFgrMT),0) END-
                                    CASE WHEN SUBSTRING(CRG_ArrDep,1,1) = 'D' THEN ISNULL(SUM(CRG_SFgrMT),0)END
        ELSE 0 END  dischargeQuantity ) quantity
END 
from #CargoPerformanceReport report
INNER JOIN POSCARGO cargo ON cargo.POS_ID = report.PositionId AND ISNULL(cargo.CRG_Deleted,0)=0

表结构

CREATE TABLE #CargoPerformanceReport
(
    PositionId              VARCHAR(12),
    PortAndActivityName     VARCHAR(100),
    PlaId                   VARCHAR(12),
    LoadDischargeQty            REAL,

);

插入#货物性能报告 值（'100'，null，'LP'，null）

结果:-

PositionId |    PlaId | LoadDischargeQty
100        |     LP   | 150

但这不是正确的方法，也有错误

---

有人为相同的问题优化过解决方案吗？

将所有这些内容放入子查询：

SELECT LoadDischargeQty = 
  CASE 
    WHEN report.PlaId = 'LP' 
    THEN 1 
    ELSE -1 
  END * cargo.qty
FROM CargoPerformanceReport report
CROSS APPLY(
  SELECT SUM(
    CASE 
      WHEN CRG_ArrDep LIKE 'D%' 
      THEN 1 
      WHEN CRG_ArrDep LIKE 'A%' 
      THEN -1 
      ELSE 0
    END * ISNULL(CRG_SFgrMT, 0)
    ) qty
  FROM POSCARGO cargo
  WHERE cargo.POS_ID = report.PositionId 
    AND ISNULL(cargo.CRG_Deleted,0)=0
) cargo

---

我不明白应该如何使用

CRG\u Quantity

列，而您没有提供任何包含该数据的行，因此我将其删除以向您显示聚合本身。工作正常，您将获得150。您可以轻松地将其转换为

update

语句。

也许类似于此？
它使用带有汇总案例的案例

对sqlfiddle的测试

样本数据

IF OBJECT_ID('tempdb..#CargoPerformanceReport') IS NOT NULL DROP TABLE #CargoPerformanceReport;
CREATE TABLE #CargoPerformanceReport
(
    PositionId          VARCHAR(12) PRIMARY KEY,
    PortAndActivityName VARCHAR(100),
    PlaId               VARCHAR(12),
    LoadDischargeQty    REAL
);

IF OBJECT_ID('tempdb..#Poscargo') IS NOT NULL DROP TABLE #Poscargo;
CREATE TABLE #Poscargo
(
    POS_ID       VARCHAR(12),
    CRG_ArrDep   VARCHAR(3),
    CRG_SFgrMT   REAL,
    CRG_Quantity REAL,
    CRG_Deleted  BIT
);

Insert into #CargoPerformanceReport Values 
('100','name1','LP',null),
('101','name2','DP',null),
('102','name3','DP',null);

Insert Into #Poscargo(POS_ID, CRG_ArrDep, CRG_SFgrMT, CRG_Quantity, CRG_Deleted) Values 
 ('100','DD',100,null,0)
,('100','AD',100,null,0)
,('100','DD',200,null,0)
,('100','AD',50,null,0)
,('101','DL',100,null,0)
,('101','AL',200,null,0)
,('102','DL',100,500,0)
,('102','AL',200,null,0);

结果

PositionId PortAndActivityName PlaId LoadDischargeQty
---------- ------------------- ----- ----------------
100        name1               LP    150
101        name2               DP    100
102        name3               DP    500

---

你能提供一些样本数据并期望结果吗？这确实有助于提供格式而不是图像谢谢我更新了问题，现在你可以检查样本数据中的

CRG\u数量

和

CRG\u删除列在哪里了？我在深入查看了你的代码后删除了我的答案。这意味着什么：
CASE WHEN SUBSTRING（CRG_-ArrDep，1,1）='D'然后为空（CRG_-SFgrMT，0）结束-当子串（CRG_-ArrDep，1,1）='A'然后为空（CRG_-SFgrMT，0）结束时为空（CRG_-ArrDep，1,1）
？您的意思是当子串（CRG_-ArrDep，1,1）='D'然后为空（CRG_-SFgrMT 0）时为空（CRG_-SFgrMT结束

？不，先生，这不是我的要求。

IF OBJECT_ID('tempdb..#CargoPerformanceReport') IS NOT NULL DROP TABLE #CargoPerformanceReport;
CREATE TABLE #CargoPerformanceReport
(
    PositionId          VARCHAR(12) PRIMARY KEY,
    PortAndActivityName VARCHAR(100),
    PlaId               VARCHAR(12),
    LoadDischargeQty    REAL
);

IF OBJECT_ID('tempdb..#Poscargo') IS NOT NULL DROP TABLE #Poscargo;
CREATE TABLE #Poscargo
(
    POS_ID       VARCHAR(12),
    CRG_ArrDep   VARCHAR(3),
    CRG_SFgrMT   REAL,
    CRG_Quantity REAL,
    CRG_Deleted  BIT
);

Insert into #CargoPerformanceReport Values 
('100','name1','LP',null),
('101','name2','DP',null),
('102','name3','DP',null);

Insert Into #Poscargo(POS_ID, CRG_ArrDep, CRG_SFgrMT, CRG_Quantity, CRG_Deleted) Values 
 ('100','DD',100,null,0)
,('100','AD',100,null,0)
,('100','DD',200,null,0)
,('100','AD',50,null,0)
,('101','DL',100,null,0)
,('101','AL',200,null,0)
,('102','DL',100,500,0)
,('102','AL',200,null,0);

PositionId PortAndActivityName PlaId LoadDischargeQty
---------- ------------------- ----- ----------------
100        name1               LP    150
101        name2               DP    100
102        name3               DP    500