Question

我有一张表＆＃39; AnimalInformation＆＃39;并希望根据购买日期透视列，如下所示。我尝试过使用枢轴但没有完全按照我的要求进行操作。你能帮我一点吗？以下提供的所有信息

Result should look like 
PurchaseDate |  CatInfo| DogInfo | FishInfo |   CatDate    | DogDate    | FishDate
----------------------------------------------------------------------------------
1/1/2016     |  Good   |  Fair   |  NotGood |   10/10/2016 | 11/10/2016 | 12/10/2016
2/2/2016     |  Bad    |  Good   |  Good    |     9/9/2016 | 10/9/2016  | 11/9/2016

 ##Table##
 CREATE TABLE [dbo].[AnimalInformation](
[UniqueId] [int] IDENTITY(1,1) NOT NULL,
[PurchaseDate] [datetime] NOT NULL,
[Animal] [nvarchar](50) NOT NULL,
[HealthDate] [datetime] NOT NULL,
[AnimalCondition] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_AnimalInformation] PRIMARY KEY CLUSTERED 
(
[UniqueId] ASC

)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF,                   
ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]

## Insert Statement ##
 Insert into AnimalInformation values ('1/1/2016' ,'Cat','10/10/2016','Good')
 Insert into AnimalInformation values ('1/1/2016' ,'Dog','11/10/2016','Fair')
 Insert into AnimalInformation values ('1/1/2016' ,'Fish','12/10/2016','Not Good')

Insert into AnimalInformation values ('2/2/2016' ,'Cat','9/9/2016','Bad')
Insert into AnimalInformation values ('2/2/2016' ,'Dog','10/9/2016','Good')
Insert into AnimalInformation values ('2/2/2016' ,'Fish','11/9/2016','Good')

## My Query ##
SELECT * FROM
 (
  SELECT
     PurchaseDate,
 Animal,
 AnimalCondition,
 HealthDate,
 (Animal + 'Info') AnimalHealthInfo,
 (Animal + 'Date') AnimalHealthDate
 FROM
  AnimalInformation
 ) X

 PIVOT ( MAX(AnimalCondition) FOR AnimalHealthInfo IN ([CatInfo],[DogInfo],[FishInfo] )
    ) As P1
 PIVOT ( MAX(HealthDate) FOR AnimalHealthDate IN ([CatDate],[DogDate],[FishDate])
    ) AS P2

Answer 1

条件聚合是你可以做到的一种方式。

SELECT
    PurchaseDate
    ,MAX(CASE WHEN Animal = 'Cat' THEN AnimalCondition END) as CatInfo
    ,MAX(CASE WHEN Animal = 'Dog' THEN AnimalCondition END) as DogInfo
    ,MAX(CASE WHEN Animal = 'Fish' THEN AnimalCondition END) as FishInfo
    ,MAX(CASE WHEN Animal = 'Cat' THEN HealthDate END) as CatDate
    ,MAX(CASE WHEN Animal = 'Dog' THEN HealthDate END) as DogDate
    ,MAX(CASE WHEN Animal = 'Fish' THEN HealthDate END) as FishDate
FROM
    AnimalInformation
GROUP BY
    PurchaseDate

然后有一种方法，你和其他几个人正在尝试哪个MikkaRin正确但忘记了列名：

SELECT
    PurchaseDate
    ,MAX(CatI) as CatInfo
    ,MAX(DogI) as DogInfo
    ,MAX(FishI) as FishInfo
    ,MAX(CatD) as CatDate
    ,MAX(DogD) as DogDate
    ,MAX(FishD) as FishDate
FROM
       (SELECT
          PurchaseDate
          ,HealthDate
          ,AnimalCondition
          ,Animal + 'I' as AnimalInfo
          ,Animal + 'D' as AnimalDate
       FROM
          AnimalInformation) t
       PIVOT
       (
          MAX(AnimalCondition)
          FOR AnimalInfo IN (CatI,DogI,FishI)
       ) p
       PIVOT
       (
          MAX(HealthDate)
          FOR AnimalDate IN (CatD,DogD,FishD)
       ) p2
GROUP BY
    PurchaseDate

或加入两个支柱：

;WITH cteHealthInfo AS (
    SELECT PurchaseDate, Cat as CatInfo, Dog as DogInfo, Fish as FishInfo
    FROM
       (SELECT PurchaseDate, AnimalCondition, Animal
       FROM
          AnimalInformation) t
       PIVOT
       (
          MAX(AnimalCondition)
          FOR Animal IN (Cat,Dog,Fish)
       ) p
)

, cteHealthDate AS (
    SELECT PurchaseDate, Cat as CatDate, Dog as DogDate, Fish as FishDate
    FROM
       (SELECT PurchaseDate, HealthDate, Animal
       FROM
          AnimalInformation) t
       PIVOT
       (
          MAX(HealthDate)
          FOR Animal IN (Cat,Dog,Fish)
       ) p
)

SELECT
    i.*
    ,d.CatDate
    ,d.DogDate
    ,d.FishDate
FROM
    cteHealthInfo i
    INNER JOIN cteHealthDate d
    ON i.PurchaseDate = d.PurchaseDate

就个人而言，我觉得条件聚合提供了最灵活的解决方案，对于这样的案例，代码量最少。我确实看到了使用unpivot然后使用pivot的有趣解决方案，但这需要数据类型保持一致。

Answer 2

SELECT PurchaseDate, 
max([CatInfo]),
max([DogInfo]),
max([FishInfo]),
max([CatDate]) ,
max([DogDate]) ,
max([FishDate])
 FROM
 (
  SELECT
     PurchaseDate,
 --Animal,
 AnimalCondition,
 HealthDate,
 (Animal + 'Info') AnimalHealthInfo,
 (Animal + 'Date') AnimalHealthDate
 FROM
  @AnimalInformation
 ) X

 PIVOT ( MAX(AnimalCondition) FOR AnimalHealthInfo IN ([CatInfo],[DogInfo],[FishInfo] )
    ) As P1
 PIVOT ( MAX(HealthDate) FOR AnimalHealthDate IN ([CatDate],[DogDate],[FishDate])
    ) AS P2

    group by PurchaseDate

SQL Logic基于两列进行透视

2 个答案: