如何根据条件将多行组合成单行

Question

我需要有关如何将数据插入具有多个条件的临时表的帮助。我有 3 个相互链接的表，我的问题是 AmountIntakeVendorRequisition 中的金额值返回每个金额的单行。因此，我需要将具有相同“AmountIntakeVendorId”的每个 Amount 组合到临时表中的 Quaters 列（Q1、Q2、Q3、Q4）中。下面是我的案例的表格。提前致谢！

摄入量

 ------ ---------------------- --------------- ------------- 
| id   |  AmountIntakeBucketId|     CenterId  |   ProjectId |   
 ------ ---------------------- --------------- ------------- 
|  400 |                 94   |         C1000 |       P100  | 
|  401 |                 95   |         C1001 |       P101  | 
|  402 |                 96   |         C1002 |       P102  | 
|  403 |                 97   |         C1003 |       P103  | 
 ------ ---------------------- --------------- ------------- 

AmountIntakeVendor

 ------ ----------------- --------------- --------------
| id   |  AmountIntakeId |     VendorId  |   ProjectName| 
 ------ ----------------- --------------- --------------
|  411 |             400 |             1 |    Microsoft | 
|  412 |             400 |             2 |         Dell | 
|  413 |             400 |             4 |       Google | 
|  414 |             400 |             4 |       Huawei | 
 ------ ----------------- ---------------- -------------

AmountIntakeVendorRequisition

  ------ ----------------------  ---------------------------- -------------------------- ------------
| id   |  AmountIntakeVendorId|                    StartDt |                    EndDt |    Amount   |
 ------ ---------------------- ---------------------------- -------------------------- -------------
| 1771 |                  411 |    2019-04-01 00:00:00.000 |  2019-06-30 23:59:59.000 |     1000.00 |
| 1772 |                  411 |    2019-07-01 00:00:00.000 |  2019-09-31 23:59:59.000 |     1430.00 |
| 1773 |                  411 |    2019-10-01 00:00:00.000 |  2019-12-31 23:59:59.000 |     2000.00 |
| 1774 |                  412 |    2019-07-01 00:00:00.000 |  2019-09-31 23:59:59.000 |     5000.00 |
 ------  ---------------------- --------------------------- -------------------------- -------------

预期结果

 ----------- ----------------------  ------------ -------------- ------------- ------------- 
| ProjectId |          ProjectName |          Q1 |           Q2 |          Q3 |          Q4 |        
 ----------- ---------------------- ------------- -------------- ------------- ------------- 
|      P100 |            Microsoft |        NULL |      1000.00 |    1430.00  |     2000.00 |  
|      P101 |                 Dell |        NULL |      5000.00 |        NULL |        NULL |         
 ----------  ---------------------- ------------- -------------- ------------- ------------- 

我已经创建了用于插入数据的表，但我坚持将“金额”插入到每个 Quaters（Q1、Q2、Q2、Q4）的 @tempTable 中

  DECLARE @AIBId Int = 94
  DECLARE @tempTable TABLE            
 (            
  ProjectId INT,            
  ProjectName NVARCHAR(100),              
  Q1 DECIMAL (12,2), --1
  Q2 DECIMAL (12,2), -- 4
  Q3 DECIMAL (12,2), --7
  Q4 DECIMAL (12,2)  --10    
 )       

INSERT into @tempTable
SELECT *
AI.ProjectId,
AIV.ProjectName,
Month(AISR.StartDate) AS Quater,
CASE Quater
WHEN 1 THEN AISR.Amount
WHEN IS NULL THEN NULL
END AS Q1
CASE Quater
WHEN 4 THEN AISR.Amount
WHEN IS NULL THEN NULL
END AS Q2
CASE Quater
WHEN 7 THEN AISR.Amount
WHEN IS NULL THEN NULL
END AS Q3
CASE Quater
WHEN 10 THEN AISR.Amount
WHEN IS NULL THEN NULL
END AS Q4
END 
FROM AmountIntake AI
LEFT JOIN AmountIntakeVendor AIV on AI.Id = AIV.AmountIntakeId
LEFT JOIN AmountIntakeVendorRequisition AIVR on AIV.ID = AIVR.AmountIntakeVendorId
WHERE AI.AmountIntakeBucketId = @AIBId 

SELECT * from @tempTable

Answer 1

您的select 查询似乎不错，只需进行少量更新即可 -

SELECT AI.ProjectId
      ,AIV.ProjectName
      ,Month(AISR.StartDate) AS Quater
      ,CASE Month(AISR.StartDate) WHEN 1 THEN AIVR.Amount END AS Q1
      ,CASE Month(AISR.StartDate) WHEN 4 THEN AIVR.Amount END AS Q2
      ,CASE Month(AISR.StartDate) WHEN 7 THEN AISR.Amount END AS Q3
      ,CASE Month(AISR.StartDate) WHEN 10 THEN AISR.Amount END AS Q4
FROM AmountIntake AI
LEFT JOIN AmountIntakeVendor AIV on AI.Id = AIV.AmountIntakeId
LEFT JOIN AmountIntakeVendorRequisition AIVR on AIV.ID = AIVR.AmountIntakeVendorId
WHERE AI.AmountIntakeBucketId = @AIBId

CASE 语句在不满足条件时自动分配 NULL，因此无需显式分配。