[英]Combine multiple rows into multiple columns dynamically in SQL Server
我有一個大型數據庫表,我需要使用Microsoft SQL Server動態執行下面的操作。
從這樣的結果:
badge | name | Job | KDA | Match
- - - - - - - - - - - - - - - -
T996 | Darrien | AP | 3.0 | 20
T996 | Darrien | ADC | 2.8 | 16
T996 | Darrien | TOP | 5.0 | 120
使用SQL得到這樣的結果:
badge | name | AP_KDA | AP_Match | ADC_KDA | ADC_Match | TOP_KDA | TOP_Match
- - - - - - - - -
T996 | Darrien | 3.0 | 20 | 2.8 | 16 | 5.0 | 120
即使有30行,它也會組合成一行60列。
我目前能夠通過硬編碼(參見下面的示例)來實現,但不是動態的。
Select badge,name,
(
SELECT max(KDA)
FROM table
WHERE (h.badge = badge) AND (h.name = name)
AND (Job = 'AP')
) AP_KDA,
(
SELECT max(Match)
FROM table
WHERE (h.badge = badge) AND (h.name = name)
AND (Job = 'AP')
) AP_Match,
(
SELECT max(KDA)
FROM table
WHERE (h.badge = badge) AND (h.name = name)
AND (Job = 'ADC')
) ADC_KDA,
(
SELECT max(Match)
FROM table
WHERE (h.badge = badge) AND (h.name = name)
AND (Job = 'ADC')
) ADC_Match,
(
SELECT max(KDA)
FROM table
WHERE (h.badge = badge) AND (h.name = name)
AND (Job = 'TOP')
) TOP_KDA,
(
SELECT max(Match)
FROM table
WHERE (h.badge = badge) AND (h.name = name)
AND (Job = 'TOP')
) TOP_Match
from table h
我需要一個MSSQL語句,允許我將多行組合成一行。 第3列( Job
)內容將與第4列和第5列( KDA
和Match
)組合並成為新列。
因此,如果Job
有6個不同的值(比如Job1
到Job6
),那么結果將有12列,例如: Job1_KDA
, Job1_Match
, Job2_KDA
, Job2_Match
等,按徽章和名稱分組。
我需要一個聲明,它可以遍歷第3列數據,因此我不需要硬編碼(對每個可能的Job
值重復查詢)或使用臨時表。
我會用動態sql來做,但這是( http://sqlfiddle.com/#!6/a63a6/1/0)PIVOT解決方案:
SELECT badge, name, [AP_KDa], [AP_Match], [ADC_KDA],[ADC_Match],[TOP_KDA],[TOP_Match] FROM
(
SELECT badge, name, col, val FROM(
SELECT *, Job+'_KDA' as Col, KDA as Val FROM @T
UNION
SELECT *, Job+'_Match' as Col,Match as Val FROM @T
) t
) tt
PIVOT ( max(val) for Col in ([AP_KDa], [AP_Match], [ADC_KDA],[ADC_Match],[TOP_KDA],[TOP_Match]) ) AS pvt
額外獎勵:PIVOT如何與動態SQL( http://sqlfiddle.com/#!6/a63a6/7/0 )結合使用,我更願意做到更簡單,沒有PIVOT,但這只是一個很好的鍛煉我 :
SELECT badge, name, cast(Job+'_KDA' as nvarchar(128)) as Col, KDA as Val INTO #Temp1 FROM Temp
INSERT INTO #Temp1 SELECT badge, name, Job+'_Match' as Col, Match as Val FROM Temp
DECLARE @columns nvarchar(max)
SELECT @columns = COALESCE(@columns + ', ', '') + Col FROM #Temp1 GROUP BY Col
DECLARE @sql nvarchar(max) = 'SELECT badge, name, '+@columns+' FROM #Temp1 PIVOT ( max(val) for Col in ('+@columns+') ) AS pvt'
exec (@sql)
DROP TABLE #Temp1
將行中的多個行和列組合並按ID進行分組
IF OBJECT_ID('usr_CUSTOMER') IS NOT NULL
DROP TABLE usr_CUSTOMER
--------------------------CRATE TABLE---------------------------------------------------
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[usr_CUSTOMER](
[Last_Name] [nvarchar](50) NULL,
[First_Name] [nvarchar](50) NULL,
[Middle_Name] [nvarchar](50) NOT NULL,
[ID] [int] NULL
) ON [PRIMARY]
GO
INSERT [dbo].[usr_CUSTOMER] ([Last_Name], [First_Name], [Middle_Name], [ID]) VALUES (N'gal', N'ornon', N'gili', 111)
GO
INSERT [dbo].[usr_CUSTOMER] ([Last_Name], [First_Name], [Middle_Name], [ID]) VALUES (N'porat', N'Yahel', N'LILl', 44444)
GO
INSERT [dbo].[usr_CUSTOMER] ([Last_Name], [First_Name], [Middle_Name], [ID]) VALUES (N'Shabtai', N'Or', N'Orya', 2222)
GO
INSERT [dbo].[usr_CUSTOMER] ([Last_Name], [First_Name], [Middle_Name], [ID]) VALUES (N'alex', N'levi', N'dolev', 33)
GO
INSERT [dbo].[usr_CUSTOMER] ([Last_Name], [First_Name], [Middle_Name], [ID]) VALUES (N'oren', N'cohen', N'ornini', 44444)
GO
INSERT [dbo].[usr_CUSTOMER] ([Last_Name], [First_Name], [Middle_Name], [ID]) VALUES (N'ron', N'ziyon', N'amir', 2222)
GO
----------------------------script---------------------------------------------
IF OBJECT_ID('tempdb..#TempString') IS NOT NULL
DROP TABLE #TempString
IF OBJECT_ID('tempdb..#tempcount') IS NOT NULL
DROP TABLE #tempcount
IF OBJECT_ID('tempdb..#tempcmbnition') IS NOT NULL
DROP TABLE #tempcmbnition
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
SELECT ID,
[Last_Name] + '#' + [First_Name] + '#' + ISNULL([Middle_Name], '') as StringRow
INTO #TempString
FROM [dbo].[usr_CUSTOMER]
ORDER BY StringRow
select distinct id
into #tempcount
from usr_CUSTOMER
CREATE TABLE [dbo].[#tempcmbnition](
[ID] [int] NULL,
[combinedString] [nvarchar](max) NULL
)
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
DECLARE @tableID table(ID int)
insert into @tableID(ID) (select distinct Id from #tempcount)
DECLARE @CNT int
SET @CNT = (select count(*) from @tableID)
declare @lastRow int
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
WHILE (@CNT >=1 )
BEGIN
SET @lastRow = (SELECT TOP 1 id FROM #tempcount ORDER BY id DESC)
DECLARE @combinedString VARCHAR(MAX)
set @combinedString = ''
SELECT @combinedString = COALESCE(@combinedString + '^ ', '') + StringRow
from #TempString
where ID = @lastRow
insert into #tempcmbnition (ID, [combinedString]) values(@lastRow ,@combinedString)
SET @CNT = @CNT-1
DELETE #tempcount where ID = @lastRow
END
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
-- if you what remove first char
-- UPDATE #tempcmbnition
-- SET combinedString = RIGHT(combinedString, LEN(combinedString) - 1)
--------------------------------------------------------------------------------
--------------------------------------------------------------------------------
select *from #TempString
select * from #tempcmbnition
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